Station instants computed with Swiss Ephemeris to the minute, in UTC. Neptune is retrograde about 1 times a year for 156–160 days.
Neptune is retrograde 2 times in 1921: from Nov 16, 1920, 08:24 UTC at 13°46′ Leo until Apr 22, 1921, 02:07 UTC at 10°58′ Leo; from Nov 18, 1921, 20:57 UTC at 15°58′ Leo until Apr 24, 1922, 15:22 UTC at 13°10′ Leo.
| Stations retrograde | At | Stations direct | At | Days | Arc | Pre-shadow from | Post-shadow to |
|---|---|---|---|---|---|---|---|
| Nov 16, 1920, 08:24 UTC * | 13°46′ Leo | Apr 22, 1921, 02:07 UTC | 10°58′ Leo | 156.74 | 2.80° | 10°58′ Leo | 13°46′ Leo |
| Nov 18, 1921, 20:57 UTC * | 15°58′ Leo | Apr 24, 1922, 15:22 UTC | 13°10′ Leo | 156.77 | 2.80° | 13°10′ Leo | 15°58′ Leo |
* period crosses a year boundary and is listed in both years.
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