← single night · whole-night plan
Which nights are best for a target over the coming weeks. The astronomy mark (darkness × altitude × Moon) is computed for every night; the weather and the overall mark exist only where Open-Meteo has a forecast (the next four days) or ERA5 history (past nights) — the rest is honestly blank.
| night of | astronomy | weather | overall | best window | highest | dark h | Moon | Moon sep. |
|---|---|---|---|---|---|---|---|---|
| 2027-02-21 Sun | 32 | — | unknown | 19:35–20:55 (good, 1.33 h) | 89.7° 15:00 | 10.01 | 99% | 130.2° |
| 2027-02-22 Mon | 35 | — | unknown | 19:40–20:55 (good, 1.25 h) | 89.6° 14:55 | 9.97 | 95% | 140.7° |
| 2027-02-23 Tue | 35 | — | unknown | 19:40–21:00 (good, 1.33 h) | 89.5° 14:55 | 9.92 | 89% | 148.3° |
| 2027-02-24 Wed | 33 | — | unknown | 19:40–20:55 (good, 1.25 h) | 89.6° 14:50 | 9.88 | 81% | 151.5° |
| 2027-02-25 Thu | 32 | — | unknown | 19:40–20:55 (good, 1.25 h) | 89.7° 14:45 | 9.84 | 72% | 149.3° |
| 2027-02-26 Fri | 30 | — | unknown | 19:40–20:50 (good, 1.17 h) | 89.7° 14:40 | 9.79 | 62% | 143.1° |
| 2027-02-27 Sat | 28 | — | unknown | 19:45–20:45 (good, 1.0 h) | 89.6° 14:35 | 9.75 | 53% | 134.7° |
| 2027-02-28 Sun | 27 | — | unknown | 19:45–20:40 (good, 0.92 h) | 89.5° 14:35 | 9.7 | 43% | 125.3° |
| 2027-03-01 Mon | 25 | — | unknown | 19:45–20:40 (good, 0.92 h) | 89.7° 14:30 | 9.66 | 34% | 115.4° |
| 2027-03-02 Tue | 23 | — | unknown | 19:45–20:35 (good, 0.83 h) | 89.7° 14:25 | 9.61 | 25% | 105.2° |
| 2027-03-03 Wed | 22 | — | unknown | 19:50–20:30 (good, 0.67 h) | 89.7° 14:20 | 9.57 | 18% | 94.9° |
| 2027-03-04 Thu | 20 | — | unknown | 19:50–20:25 (good, 0.58 h) | 89.5° 14:15 | 9.52 | 11% | 84.4° |
| 2027-03-05 Fri | 18 | — | unknown | 19:50–20:20 (good, 0.5 h) | 89.6° 14:15 | 9.47 | 6% | 73.9° |
| 2027-03-06 Sat | 16 | — | unknown | 19:50–20:20 (good, 0.5 h) | 89.7° 14:10 | 9.43 | 2% | 63.5° |
| 2027-03-07 Sun | 13 | — | unknown | 19:55–20:15 (good, 0.33 h) | 89.7° 14:05 | 9.38 | 0% | 53.2° |
| 2027-03-08 Mon | 13 | — | unknown | 19:55–20:10 (good, 0.25 h) | 89.6° 14:00 | 9.33 | 0% | 43.6° |
| 2027-03-09 Tue | 11 | — | unknown | 19:55–20:05 (good, 0.17 h) | 89.5° 13:55 | 9.28 | 3% | 35.3° |
| 2027-03-10 Wed | 9 | — | unknown | 19:55–20:00 (good, 0.08 h) | 89.6° 13:55 | 9.23 | 7% | 29.7° |
| 2027-03-11 Thu | 6 | — | unknown | 20:00–20:30 (marginal, 0.5 h) | 89.7° 13:50 | 9.19 | 13% | 28.8° |
| 2027-03-12 Fri | 5 | — | unknown | 20:00–20:25 (marginal, 0.42 h) | 89.7° 13:45 | 9.14 | 21% | 33.3° |
| 2027-03-13 Sat | 4 | — | unknown | 20:00–20:25 (marginal, 0.42 h) | 89.6° 13:40 | 9.09 | 31% | 41.5° |
| 2027-03-14 Sun | 3 | — | unknown | 20:00–20:20 (marginal, 0.33 h) | 89.5° 13:40 | 9.04 | 42% | 51.8° |
| 2027-03-15 Mon | 2 | — | unknown | 20:00–20:10 (marginal, 0.17 h) | 89.7° 13:35 | 8.99 | 53% | 63.3° |
| 2027-03-16 Tue | 1 | — | unknown | — | 89.7° 13:30 | 8.94 | 64% | 75.5° |
| 2027-03-17 Wed | 1 | — | unknown | — | 89.7° 13:25 | 8.89 | 75% | 88.1° |
| 2027-03-18 Thu | 1 | — | unknown | — | 89.5° 13:20 | 8.84 | 84% | 100.7° |
| 2027-03-19 Fri | 1 | — | unknown | — | 89.6° 13:20 | 8.79 | 92% | 113.3° |
| 2027-03-20 Sat | 1 | — | unknown | — | 89.7° 13:15 | 8.73 | 97% | 125.4° |
| 2027-03-21 Sun | 0 | — | unknown | — | 89.7° 13:10 | 8.68 | 100% | 136.4° |
| 2027-03-22 Mon | 0 | — | unknown | — | 89.6° 13:05 | 8.63 | 100% | 145.4° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2027-02-21&days=30"
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&days=30&format=csv" -o m31-calendar.csvOne row per night: score_astronomy always, score_weather / score only where a forecast or history exists (null otherwise, with weather_source saying which), best window, dark hours, Moon illumination and separation, transit. 7–60 nights. Errors: 400 with invalid_date or target_unresolved. Results are cached for six hours; calculation version 2026-10-10.1.