Star trail above the T60cm teslescope at Pic du Midi observatory, France credits: A. Santerne

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   Dr. Alexandre Santerne 🌍 (alexsanterne@astrodon.social)'s status on Sunday, 18-Dec-2022 23:45:50 JST Dr. Alexandre Santerne 🌍

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   As the Earth is spherical, if we point towards the celestial pole, star will slowly trail drawing a circle. If we point towards the celestial equator, star are quickly trailing along a line.

   If your field-of-view is large enough, you can even get both the celestial pole and equator.