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Discover the celestial myths and cosmic rituals of ancient priests and kings . . .Drawing on intimate knowledge of the more than 1,300 ancient sites he has visited, E. C. Krupp, acclaimed writer and preeminent researcher, takes you to the world's essential sacred places and celestial shrines. Join him on a rich narrative journey to see where the rulers of old communed with the gods of the sky.""Highly recommended to everyone interested in the culture of astronomy and those peoples who practiced it in their own ways.""-Sky & Telescope""A lively account of the ways in which our ancestors conceived of and used the heavens.""-New Scientist""There can be no doubt that this imaginative and readable work by a widely read and widely traveled author will strike a chord in the minds of a great many modern readers.""-Isis""The fact that the book is written by an expert in his field comes through on every page, as does his enthusiasm for the subject.""-Astronomy Now""Krupp's indispensable volume is fascinating, well-illustrated, and covers much territory.""-Parabola

Why settle for anything less than the pinnacle of convenience and security when attaching eyepieces to your telescope? The Baader M56 2" Clicklock Clamp is an essential accessory for Celestron and Skywatcher refractor telescope owners. Engineered with precision to fit all models equipped with M56 threads, this clamp is the epitome of user-friendly design, offering a quick and effortless way to change eyepieces and accessories.The Baader M56 2" Clicklock Clamp stands out with its robust and durable construction, ensuring that your valuable eyepieces are held securely without the risk of slippage or misalignment. Even the heaviest and longest of accessories will stay firmly in place, allowing you to focus on the stars without worry. The clamp's innovative locking mechanism requires a mere 20-degree rotation, making it incredibly easy to operate with very low force needed, which is a testament to its high-quality engineering.For those looking to expand their astronomical toolkit, the clamp can be used in conjunction with the expansion ring #2958242 to convert to a T-2 thread, accommodating a wide range of T-2 compatible items. This feature adds only 1mm of optical length, preserving the integrity of your viewing experience.The Baader M56 2" Clicklock Clamp is not only sturdy and versatile but also enhances the overall functionality of your telescope setup. Its design ensures that there is absolutely no sag or misalignment, even with heavy and long accessories, which is crucial for achieving clear and stable astronomical observations.Astronomy enthusiasts who choose the Baader M56 2" Clicklock Clamp do so for its specific design tailored for Celestron/Skywatcher telescopes, guaranteeing a perfect fit and stable performance. The positive customer reviews highlight its reliability and effectiveness, making it a preferred choice for those seeking a hassle-free and secure eyepiece attachment solution.Elevate your celestial viewing experience with the Baader M56 2" Clicklock Clamp, a high-quality, durable, and user-friendly accessory that promises to transform the way you engage with the night sky.

You'll experience a seamless stargazing experience with the 180mm V DoveTail, specifically designed for Vixen, Celestron, and Skywatcher telescope mounts. This robust and reliable accessory, crafted by the renowned Baader Planetarium, ensures a secure and stable fit for your telescope, enhancing your celestial viewing experience. The sturdy V (EQ) design features centrally milled slots, offering a versatile solution for various telescope mounts. With a length of 180mm, it provides ample space to securely mount your telescope. The black anodized finish not only adds to its aesthetic appeal but also enhances its durability, making it a long-lasting addition to your astronomical equipment. Whether you're an amateur astronomer or a seasoned professional, this durable and reliable 180mm V DoveTail is an essential tool for your celestial explorations. Its compatibility with Vixen, Celestron, Skywatcher, and other mounts makes it a versatile choice for a wide range of telescopes. Experience the difference in stability and security with this high-quality dovetail plate for telescope mounts.

Discover the robust and reliable 120mm V DoveTail, meticulously designed for Vixen, Celestron, and Skywatcher Telescope Mounts. This high-quality accessory, crafted by the renowned Baader Planetarium, is an essential addition to your astronomical equipment collection. The 120mm V DoveTail is not just durable but also boasts a sturdy construction, ensuring long-lasting performance. It features centrally milled slots, a detail that enhances its compatibility with various telescope mounts. This design element ensures a secure fit, providing a stable and reliable platform for your celestial viewing experiences. Designed to fit Vixen, Celestron, Skywatcher, and other popular telescope mounts, this versatile accessory broadens your scope for astronomical exploration. Its black anodized finish not only adds to its aesthetic appeal but also offers an extra layer of protection, enhancing the product's durability and resistance to wear and tear. Invest in the 120mm V DoveTail for a seamless and enhanced stargazing experience, knowing it's designed for compatibility and ease of use with your Vixen, Celestron, or Skywatcher telescope mount.

Skywatchers of Ancient Mexico helped establish the field of archaeoastronomy, and it remains the standard introduction to this subject. Combining basic astronomy with archaeological and ethnological data, it presented a readable and entertaining synthesis of all that was known of ancient astronomy in the western hemisphere as of 1980.In this revised edition, Anthony Aveni draws on his own and others' discoveries of the past twenty years to bring the Skywatchers story up to the present. He offers new data and interpretations in many areas, including: The study of Mesoamerican time and calendrical systems and their unprecedented continuity in contemporary Mesoamerican culture The connections between Precolumbian religion, astrology, and scientific, quantitative astronomy The relationship between Highland Mexico and the world of the Maya and the state of Pan-American scientific practices The use of personal computer software for computing astronomical dataWith this updated information, Skywatchers will serve a new generation of general and scholarly readers and will be useful in courses on archaeoastronomy, astronomy, history of astronomy, history of science, anthropology, archaeology, and world religions.

For stargazers, comet-spotters and planet-seekers looking to enhance your deep sky knowledge and observations - this is your quintessential guide. The Total Skywatcher’s Manual will help you choose the best telescope, identify constellations and objects in the night sky, search for extraterrestrial phenomena, plan star parties, capture beautiful space imagery and much more. With high-quality design, intricate detail, and a durable flexicover—this manual is the perfect gift!With fully illustrated star charts, gorgeous astrophotography and step-by-step project instruction, this family friendly book is the only guide you’ll ever need to navigate the nightsky. Learn about the phases of the moon, how to conduct your own deep-sky observations, how the universe is expanding, our search for life on other planets, meteors vs. meteorites, sunspots and solar flares, best eclipse-viewing techniques—everything you need to know to appreciate the wonder of our universe.  Based in San Francisco, the Astronomical Society of the Pacific has a 125-year history of providing resources, tools, and information to astronomy enthusiasts, including amateur astronomers, families, and science educators (K-16). Join the ASP on this journey through the nightsky and beyond.

One group of prehistoric farming people of Central Arizona have been identified by archaeologists as the Sinagua. They occupied the area from about A.D. 600 to 1400. It has been shown that the Hopi of northeastern Arizona are culturally affiliated with the prehistoric Sinagua culture. The sunwatching techniques by the Hopi have been well documented, so similar associations were likely present in Sinagua society. This study is the result of several years of visiting various ancient Sinagua sites to identify and document evidence of sunwatching practices.

This collection of 83 articles on the history of astronomy is the harvest of a quarter of a century spent in seeking out intriguing, unusual and half-forgotten events. Joe Ashbrook wrote a column regularly for the monthly magazine Sky and Telescope. Professor Owen Gingerich, of the Harvard-Smithsonian Center for Astrophysics, has helped in the selection of the very best of these timeless vignettes, and he has contributed a foreword to the collection. Each article has been edited, and in some cases modified, to take account of any subsequent discoveries. Articles are grouped into themes covering biography, telescopes, the solar systems, stars and galaxies, and star atlases. Much of the material cannot be found in standard references in the history of astronomy.

This collection of 83 articles on the history of astronomy is the harvest of a quarter of a century spent in seeking out intriguing, unusual and half-forgotten events. Joe Ashbrook wrote a column regularly for the monthly magazine Sky and Telescope. Professor Owen Gingerich, of the Harvard-Smithsonian Center for Astrophysics, has helped in the selection of the very best of these timeless vignettes, and he has contributed a foreword to the collection. Each article has been edited, and in some cases modified, to take account of any subsequent discoveries. Articles are grouped into themes covering biography, telescopes, the solar systems, stars and galaxies, and star atlases. Much of the material cannot be found in standard references in the history of astronomy.

One group of prehistoric farming people of Central Arizona have been identified by archaeologists as the Sinagua. They occupied the area from about A.D. 600 to 1400. It has been shown that the Hopi of northeastern Arizona are culturally affiliated with the prehistoric Sinagua culture. The sunwatching techniques by the Hopi have been well documented, so similar associations were likely present in Sinagua society. This study is the result of several years of visiting various ancient Sinagua sites to identify and document evidence of sunwatching practices.

This practical manual provides essential material for the extensive world-wide community of non-professional astronomers. Every page of the book is alive with the infectious enthusiasm of the author whose expertise, knowledge and teaching experience provides easy access to the fascination and enjoyment of sky-watching.Provides essential material for the extensive world-wide community of non-professional astronomersThe author’s enthusiasm is reflected in every page, and his expertise, knowledge and teaching experience provides easy access to the fascination and enjoyment of sky-watchingIncludes chapters on the celestial sphere, the sun and sundials, star positions, star maps, planispheres and nomograms, and light and basic optics

From the #1 New York Times bestselling author of Astrophysics for People in a Hurry comes a fascinating guide to the most popular questions about the universe.In Neil de Grasse Tyson's delightful tour of the galaxies, his fictional character Merlin responds to popular astronomy questions asked by adults and children alike. Merlin, a visitor from Planet Omniscia in the Andromeda Galaxy, has been friends with many of the most important scientific figures of the past, including da Vinci, Magellan, Doppler, Einstein, and Hubble—and he often recounts his conversations with these historical figures in his explanations. Merlin's illuminating answers feature a unique combination of wit and poetry along with serious science explained in refreshingly clear, reader-friendly language.Dear Merlin: Can a person cross our galaxy in a spaceship during one human lifespan?Merlin: In 1905, Merlin's good friend Albert Einstein introduced the "Special Theory of Relativity," which predicts that time will tick slower and slower the faster you travel. Were you to embark on such an adventure you could conceivably age as little as you wish, depending of course, on your exact speed. The problem arises when you return to Earth, which will have moved several hundred thousand years into the future and everyone will have forgotten about you.A timeless book for lovers of the universe by one of its greatest lights.

From the #1 New York Times bestselling author of Astrophysics for People in a Hurry comes a fascinating guide to the most popular questions about the universe.In Neil de Grasse Tyson's delightful tour of the galaxies, his fictional character Merlin responds to popular astronomy questions asked by adults and children alike. Merlin, a visitor from Planet Omniscia in the Andromeda Galaxy, has been friends with many of the most important scientific figures of the past, including da Vinci, Magellan, Doppler, Einstein, and Hubble—and he often recounts his conversations with these historical figures in his explanations. Merlin's illuminating answers feature a unique combination of wit and poetry along with serious science explained in refreshingly clear, reader-friendly language.Dear Merlin: Can a person cross our galaxy in a spaceship during one human lifespan?Merlin: In 1905, Merlin's good friend Albert Einstein introduced the "Special Theory of Relativity," which predicts that time will tick slower and slower the faster you travel. Were you to embark on such an adventure you could conceivably age as little as you wish, depending of course, on your exact speed. The problem arises when you return to Earth, which will have moved several hundred thousand years into the future and everyone will have forgotten about you.A timeless book for lovers of the universe by one of its greatest lights.

Find the perfect balance of durability and precision with the iOptron Tri-Pier Top Adapter, meticulously engineered for Takahashi/SkyWatcher NEQ6, HEQ5, and AZEQ6 mounts. This robust adapter is a must-have for any serious astronomy enthusiast, offering a high-quality, reliable solution for mounting your equipment securely.Constructed with a sturdy tri-pier design, this adapter ensures optimal stability, reducing the risk of equipment damage during use. Its compatibility with specific Takahashi and SkyWatcher mounts makes it an ideal choice for those seeking seamless integration and ease of use. The iOptron Tri-Pier Top Adapter is not just durable, but also boasts of superior machining, as noted by our customers. Its precise fit for the Orion Atlas EQ-G and other similar mounts is a testament to its well-crafted design. Please note, while this adapter is advertised to work with the HEQ5 mount, an additional adapter may be required for a perfect fit. Regardless, once set up, this adapter promises to provide a stable and secure platform for your viewing needs.Incorporate this sturdy, high-quality iOptron Tri-Pier Top Adapter into your astronomy setup and experience the difference in stability and precision it brings to your stargazing sessions.

Discover the unparalleled precision and stability of the Baader ClickLock Clamp, designed specifically for 2" eyepieces. This high-quality clamp, compatible with Skywatcher Esprit, TS-Optics, and Omegon Telescopes, offers a secure hold for your eyepieces, CCD cameras, and similar accessories without the need for clamping screws. The ClickLock Clamp's unique design ensures your equipment is locked against rotation and protected from scratches. With a simple 20-degree turn, your eyepiece is firmly clamped in place, eliminating the need to fumble with small locking screws. This feature is particularly useful when wearing gloves or working in low light conditions. Constructed from seven precision-machined components, the ClickLock Clamp provides a robust retention mechanism that securely holds any 1-1/4" or 2" eyepiece. Its mechanical principle, derived from professional mechanical engineering, allows for a secure hold without the need for excessive force. The ClickLock Clamp's clever use of leverage multiplies the torque, holding the inserted object on three sides, similar to a quick-action chuck. This prevents any tilting movements, ensuring stability and precision during your observations. The 2" ClickLock system is designed for superior mechanical solidity. A light 20-degree turn of the rotary lever is all it takes to hold all 2" accessories securely. The clamp also features a ratchet function, providing acoustic and haptic feedback, so you can easily determine whether the clamp is open or closed, even in the dark. The ClickLock Clamp also boasts a massive tension ring, ensuring the safety of even your most expensive accessories without causing scratches or damage. The position of the rotary lever is adjustable for left-hand or right-hand use, making it a versatile tool for all astronomers. The Baader 2" ClickLock Clamp is part of an extensive range of ClickLock clamps, allowing for easy retrofitting on many telescope models. Experience the comfort, precision, and stability of this innovative clamping device, and elevate your astronomical observations to new heights.

Bring precision and stability to your astronomy equipment with the PAN 3" / EQ 370mm Dual Dovetail Clamp. Designed to fit all 3" Losmandy, as well as Vixen, Celestron, and Skywatcher EQ-style dovetail bars, this clamp provides a secure and steady hold for your scopes, cameras, and other accessories. With a length of 370mm, this dual dovetail clamp features three two-stage brass clamping blocks that ensure a firm grip and multi-point contact surface for enhanced stability. The pre-drilled holes allow for easy mounting and fixing using an allen wrench, while the toothed surfaces maximize contact points with any rail, ensuring a safe and absolutely secure clamp. This robust clamp is capable of holding Optical Tube Assemblies (OTAs) steady, eliminating any possibility of movement. Despite its sturdy build, the PAN 3" / EQ 370mm Dual Dovetail Clamp weighs in at a manageable 1500g, making it a practical addition to your astronomy gear. Whether you're an amateur astronomer or a seasoned professional, this dual dovetail clamp is a reliable tool for securing your equipment and enhancing your stargazing experience.

If you're an astrophotography enthusiast seeking a durable and versatile accessory, the RT-Adapter with M90x1 Threads is the perfect addition to your equipment. Specifically designed for BDS-RT Diamond Steeltrack and Skywatcher Refractors, this high-quality adapter ensures a seamless connection to Skywatcher Refractors with M90x1 outer threads. Crafted by the reputable Baader Planetarium, a brand synonymous with innovative and top-tier astronomical equipment, this adapter is not only functional but also stylish. It's an essential tool for those who want to optimize their astrophotography setup. Please note, this adapter is exclusively suitable for BDS-RT Diamond Steeltrack for Refractors, ensuring a perfect fit and optimal performance. Enhance your astrophotography experience with this versatile RT-Adapter with M90x1 Threads.

Because precision in astronomy is paramount, the Baader Planetarium RT-Adapter with M90x1.5 Outer Threads is an essential accessory for astrophotography enthusiasts and professionals alike. This durable adapter is specifically engineered to seamlessly connect BDS-RT Diamond Steeltrack focusers to Skywatcher Refractors, ensuring a secure and stable link between your telescope and imaging equipment.Crafted from high-quality materials, the adapter boasts a stylish design that complements the sleek appearance of your astronomical setup. Its innovative construction not only enhances the visual appeal but also provides a reliable and versatile solution for your observational needs.The adapter's M90x1.5 outer threads are meticulously designed for a perfect fit, guaranteeing an uncompromised connection that is crucial for achieving sharp, precise images of celestial bodies. This level of compatibility is a testament to Baader Planetarium's reputation for producing top-tier astronomical equipment, making this adapter a preferred choice for those who demand excellence in their astrophotography pursuits.Whether you're capturing the intricate details of the lunar surface or the majestic swirl of distant galaxies, the RT-Adapter with M90x1.5 Outer Threads for BDS-RT Diamond Steeltrack and Skywatcher Refractors is an innovative tool that will elevate the quality of your work, ensuring that every shot is a testament to the wonders of the cosmos.

It's time to enhance your stargazing experience with the Baader 2" ClickLock Eyepiece Clamp, designed with male M54x1 threads, making it a perfect fit for Celestron, SkyWatcher, and Orion Reflectors. This high-quality eyepiece clamp is meticulously crafted, offering a robust and precise fit without the need for clamping screws. The Baader ClickLock Eyepiece Clamp ensures a secure hold for your eyepieces, CCD cameras, and similar accessories, locking them against rotation and eliminating the risk of scratches. With a simple 20-degree turn, your eyepiece is firmly clamped, eliminating the need for handling small locking screws. This feature is particularly useful when wearing gloves, as the top of the eyepiece clamp can be easily rotated to secure the eyepiece.Constructed from seven precision-machined components, the ClickLock clamps offer an effective retention mechanism that securely holds any 1-1/4" or 2" eyepiece. The assembly of this clamp may seem costly, but the comfort, precision, and stability it offers make it a worthwhile investment. The mechanical principle of the ClickLock clamps is derived from professional mechanical engineering, similar to the tool holder in modern CNC milling centers. This clever use of leverage multiplies the torque, holding the inserted object on three sides, similar to a quick-action chuck, preventing any tilting movements. The 2" ClickLock system is designed to be mechanically solid. A light 20-degree turn of the rotary lever is enough to hold all 2" accessories securely. The ratchet function provides acoustic and haptic feedback, letting you know if the clamp is open or closed, even in the dark. The massive tension ring ensures the safety of even the most expensive accessories, without causing scratches or bruises. The position of the rotary lever is adjustable for left-hand or right-hand use, either by six camera slotted screws or by six Allen screws with a hexagonal wrench, depending on the model. The Baader 2" ClickLock Eyepiece Clamp has been tested to withstand heavy loads, making it a reliable addition to your telescope setup. The extensive range of ClickLock clamps allows you to retrofit the Baader 2" ClickLock clamp on many telescopes, enhancing your celestial viewing experience.

With the Steeltrack RT2 Adapterset, elevate your stargazing experience to new heights. This durable and high-quality accessory is specifically engineered for compatibility with Skywatcher, Celestron, and Zeiss refractors, ensuring a seamless integration with some of the most respected brands in the astronomy equipment industry. The adapterset boasts a versatile design, featuring adapter threads for M68 (Zeiss), M80 (Baader), and M90 telescope tube ends, making it an innovative solution for attaching a wide range of eyepieces and other telescope accessories.Crafted by the renowned Baader Planetarium, this adapterset exemplifies their commitment to excellence and attention to detail. The stylish finish not only adds an aesthetic appeal to your telescope setup but also signifies the premium quality that Baader Planetarium is known for. Whether you're an amateur astronomer or a seasoned sky observer, the Steeltrack RT2 Adapterset is a smart choice for enhancing your observational capabilities.Choose the Steeltrack RT2 Adapterset for its unparalleled adaptability and the assurance of a product made by a trusted name in astronomical equipment. Its robust construction ensures long-lasting performance, allowing you to explore the cosmos with confidence and clarity. Discover the universe through your telescope with this essential, innovative accessory that stands out in both functionality and design.