How the ancient Greeks understood the universe; what they got right and what they got wrong. How Aristotle understood the Earth was round by observing lunar eclipses; how Aristarchus of Samos used these results to work out the relative sizes of Earth, the Sun, and Moon, how Eratosthenes of Cyrene measured Earth’s circumference, and how Hipparchus of Nicaea determined created the first catalog of stars and discovered Earth’s 26,000 year axial precession, Finally, we take a look at Claudius Ptolemy’s collection of works in the Almagest, and how he came up with a system of epicycles to explain planets’ retrograde motion.
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CELESTRON StarSense Explorer DX 130AZ Smartphone App-Enabled Telescope – Works with StarSense App to Help You Find Stars, Planets & More – 130mm Newtonian Reflector – iPhone/Android Compatible
$479.95 (as of December 22, 2024 02:59 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Koolpte Telescope, 70mm Aperture 400mm AZ Mount Astronomical Refracting Telescope (20x-200x) for Kids & Adults, Portable Travel Telescope with Tripod Phone Adapter, Remote Control, Easy to Use, Black
$74.99 (as of December 22, 2024 02:59 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Telescope for Kids & Adults - 70mm Aperture 500mm AZ Mount Fully Multi-Coated Optics Astronomical refracting Portable Telescopes, with Tripod Phone Adapter, Carrying Bag, Remote Control White
$79.99 (as of December 22, 2024 02:59 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Celestron - 70mm Travel Scope - Portable Refractor Telescope - Fully-Coated Glass Optics - Ideal Telescope for Beginners - Bonus Astronomy Software Package
$79.89 (as of December 22, 2024 02:59 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Telescope,Telescope for Adults High Powered, 90mm Aperture 900mm Professional Refractor Telescope for Kids & Beginners, Magnification 450X, for Planet Observation with Stainless Tripod & Phone Adapter
$239.98 (as of December 22, 2024 02:59 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Celestron - AstroMaster 130EQ-MD Newtonian Telescope - Reflector Telescope for Beginners - Fully-Coated Glass Optics - Adjustable-Height Tripod - Bonus Astronomy Software Package
$280.49 (as of December 22, 2024 02:59 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Astronomical Refracting Telescope,MLABINYA 70mm Travel Telescope(15X-150X) Portable Telescope with Multilayer Broadband Coating Adjustable Tripod And Finderscope, Telescope for Adults & Kids &Beginner
$44.99 (as of December 22, 2024 02:59 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
(24X-180X) 80mm Aperture 600mm AZ Mount Telescope for Kids and Adult,High Powered Telescope,High-Performance Optical Lenses and Stabilized Adjustable Tripod,Simple to Install and Easy to Operate
(as of December 22, 2024 02:59 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Telescope for Adults Beginners, 70mm Aperture 400mm Refractor Telescopes for Astronomy Beginners, Portable Travel Telescope Astronomy Gifts (40070)
$59.99 (as of December 22, 2024 02:59 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)