Fix various solar position calculations when DatetimeIndex.unit is not ns
#1881
| Job | Run time |
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| 1m 2s | |
| 2m 11s | |
| 57s | |
| 2m 6s | |
| 56s | |
| 2m 16s | |
| 1m 4s | |
| 2m 16s | |
| 52s | |
| 1m 44s | |
| 1m 5s | |
| 1m 22s | |
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| 1m 28s | |
| 2m 1s | |
| 1m 26s | |
| 1m 48s | |
| 3m 39s | |
| 4m 5s | |
| 4m 0s | |
| 6m 20s | |
| 4m 45s | |
| 3m 17s | |
| 1m 2s | |
| 55m 14s |