The Distance to the Moon, Sun, and Stars | Part 1 History

In this first of three episodes, we look at how astronomers from Aristarchus to Cassini helped define the Astronomical Unit- the average distance from the earth to the sun. The brilliance of these men was only limited by the measurement tools at their disposal. Aristarchus (300 BC)- the Earth to the Sun in units of distance to the Moon. Kepler (1618)- the orbits of the planet in terms of Astronomical Units/Ratios and the transits of Mercury and Venus. Horrocks (1639)- the distance to the Sun by measuring the angular size of Venus. Cassini and Flamsteed (1671) measuring the distance to Mars in Opposition For a detailed review of Ancient Greek Mathematics on the distance to the Sun and Moon, see: Physics Explained https://youtu.be/urgYWNCN-RA Part 2 The Epic Observation of the Transit of Venus in 1769 by Cook et Al, the transits of 1874 and 2004/2012. Part 3 Parallax to the stars and Bob proposes a space mission. Bob the Science Guy is a YouTube Creator hosting a daily live stream and creating original content debunking conspiracies such as Flat Derp, Moon Landing Denial and Anti-Derp. Join our Discord Channel at https://discord.gg/CA2r9U378X Bob the Science Guy on YouTube: https://discord.gg/CA2r9U378X Bob the Science Guy on Twitch: https://www.twitch.tv/bobthescienceguy Common Sense Science on YouTube (astronomy and Science): https://www.youtube.com/channel/UCnTW4kCAmTt2qtXJ13kGxYA Support the Channel and help with the costs of the telescope and video Equipment: https://www.patreon.com/bobthescienceguy To make a direct donation for the telescope mount, click here: https://www.paypal.com/donate?hosted_button_id=P6THXXKV5UR9Q Cool Stuff from the Bob the Science Guy Store: https://teespring.com/stores/cool-mugs-and-stuff-from-bob Thank you for stopping by! Bob the Science Guy


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