Astronomical Units of Lengths

Standard Measurements:

• A year = 365 days
• A circle = 360° (chosen by the Babylonians as a multiple of 60) = 2πᶜ {radians}. Each degree in a circle = 60 arcminutes. Each arcminute = 60 arcseconds.
• 1ᶜ {radian} = 57.3°
• 1" {inch} = 2.54 cm
• 1 AU {Astronomical Unit} = 149.6×10⁹ m (that's the average distance between the earth 🌍 and our sun ☀️)
• 1 pc {Parsec} is a distance = 30.857×10¹⁵ m = 206'265 AU = 3.26 light years
• 1 LY {light year} = 9.46×10¹⁵ m = 63'240 AU

---

Refer also to Earth's procession