How Star Trails Reveal Earth’s Rotation and the Celestial Poles @BobtheScienceGuy

Uploaded March 2021 | Updated September 2026, 3 weeks ago

Star trails record the apparent motion of the sky as Earth rotates. This video explains clockwise and counterclockwise sky motion, the north and south celestial poles, Polaris, 15-degree-per-hour star motion, equatorial telescope mounts, and why star trails can also form around the rotational axis of an orbiting spacecraft such as the ISS.

How Star Trails Reveal Earth’s Rotation and the Celestial Poles

$Satellites and the ISS We are going to have a look at satellites, some deep space objects (perhaps a comet) and try to catch a glimpse of the ISS. Gear: StellarVue 80 (SV80) 80mm refractor Exos2-PMC8 equatorial mount Canon Rebel SL1 Camera Software: PHD2 Stellarium Astrophotography Tool SharpCap SkyTrack Satellite Tracker We have a rare clear night, so lets have a look... Bob the Science Guy is a YouTube Creator hosting a daily live stream and creating original content debunking conspiracies such as Flat Earth, Moon Landing Denial and Anti-Vaxx. https://discord.gg/QwcFct7DWc Bob the Science Guy on YouTube: https://discord.gg/CA2r9U378X Bob the Science Guy on Twitch: https://www.twitch.tv/bobthescienceguy Common Sense Science on YouTube (astronomy and Science): https://www.twitch.tv/bobthescienceguy Support the Channel and help with the costs of the telescope and video Equipment: https://www.patreon.com/bobthescienceguy Thank you for stopping by! Bob the Science Guy$

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