To convert sidereal days to fortnights, multiply the value by 0.0712335. To go the other way, multiply fortnights by 14.0383 to get sidereal days.
| Sidereal Days (sid d) | Fortnights (fn) |
|---|---|
| 1 sid d | 0.0712335 fn |
| 2 sid d | 0.142467 fn |
| 3 sid d | 0.213701 fn |
| 4 sid d | 0.284934 fn |
| 5 sid d | 0.356168 fn |
| 6 sid d | 0.427401 fn |
| 7 sid d | 0.498635 fn |
| 8 sid d | 0.569868 fn |
| 9 sid d | 0.641102 fn |
| 10 sid d | 0.712335 fn |
| 12 sid d | 0.854802 fn |
| 14 sid d | 0.99727 fn |
| 15 sid d | 1.0685 fn |
| 20 sid d | 1.42467 fn |
| 21 sid d | 1.4959 fn |
| 24 sid d | 1.7096 fn |
| 25 sid d | 1.78084 fn |
| 30 sid d | 2.13701 fn |
| 40 sid d | 2.84934 fn |
| 50 sid d | 3.56168 fn |
| 60 sid d | 4.27401 fn |
| 75 sid d | 5.34252 fn |
| 80 sid d | 5.69868 fn |
| 100 sid d | 7.12335 fn |
| 200 sid d | 14.2467 fn |
| 250 sid d | 17.8084 fn |
| 300 sid d | 21.3701 fn |
| 400 sid d | 28.4934 fn |
| 500 sid d | 35.6168 fn |
| 750 sid d | 53.4252 fn |
| 1,000 sid d | 71.2335 fn |
Sidereal day (sid d). A sidereal day (23 h 56 min 4.09 s) is one rotation of the Earth relative to the stars.
Fortnight (fn). A fortnight is 14 days (two weeks).
There are 0.0712335 fortnights in one sidereal day.
Multiply the number of sidereal days by 0.0712335. For example, 10 sidereal days equal 0.712335 fortnights.
One fortnight equals 14.0383 sidereal days.
0.854802 fortnights. Other common values: 5 sidereal days = 0.356168 fortnights and 100 sidereal days = 7.12335 fortnights.