An Equinox is an event when the Sun passes through the Earth’s equatorial plane. This can be found by using gfposc to search for when the Sun’s Rectangular Z coordinate in the J2000 reference frame equals zero. This aligns the Z axis with the J2000 north pole, so when Z is 0 the Sun is in the J2000 equatorial plane.
| Input | Value |
|---|---|
| Target | SUN |
| Reference Frame | J2000 |
| Observer | EARTH |
| Coordinate System | Rectangular |
| Coordinate | Z |
| Relate | Equals |
| Value | 0 |
When does the sun pass through earth’s equatorial plane?
Copy Equinox Finder to Clipboard
Results:
Equinox Found : 2022 MAR 20 22 : 50 : 14.464 UTC
Equinox Found : 2022 SEP 23 08 : 39 : 05.864 UTC
Equinox Found : 2023 MAR 21 05 : 03 : 29.827 UTC
Equinox Found : 2023 SEP 23 14 : 47 : 07.567 UTC
Equinox Found : 2024 MAR 20 11 : 07 : 20.522 UTC
Equinox Found : 2024 SEP 22 21 : 04 : 21.333 UTC
