← 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. |
|---|---|---|---|---|---|---|---|---|
| 2039-04-01 Fri | 6 | — | unknown | 21:25–22:05 (marginal, 0.67 h) | 72.5° 16:30 | 8.09 | 50% | 42.5° |
| 2039-04-02 Sat | 5 | — | unknown | 21:25–21:55 (marginal, 0.5 h) | 72.5° 16:25 | 8.04 | 60% | 54.7° |
| 2039-04-03 Sun | 4 | — | unknown | 21:25–21:50 (marginal, 0.42 h) | 72.5° 16:25 | 7.98 | 70% | 67.2° |
| 2039-04-04 Mon | 3 | — | unknown | 21:30–21:50 (marginal, 0.33 h) | 72.5° 16:20 | 7.93 | 79% | 80.0° |
| 2039-04-05 Tue | 3 | — | unknown | 21:30–21:50 (marginal, 0.33 h) | 72.5° 16:15 | 7.87 | 87% | 93.4° |
| 2039-04-06 Wed | 4 | — | unknown | 21:30–21:50 (marginal, 0.33 h) | 72.5° 16:10 | 7.81 | 93% | 107.1° |
| 2039-04-07 Thu | 3 | — | unknown | 21:35–21:45 (marginal, 0.17 h) | 72.5° 16:05 | 7.76 | 98% | 121.3° |
| 2039-04-08 Fri | 2 | — | unknown | 21:35–21:40 (marginal, 0.08 h) | 72.5° 16:05 | 7.7 | 100% | 135.8° |
| 2039-04-09 Sat | 2 | — | unknown | 21:35–21:40 (marginal, 0.08 h) | 72.5° 16:00 | 7.64 | 99% | 150.4° |
| 2039-04-10 Sun | 2 | — | unknown | 21:00–21:05 (marginal, 0.08 h) | 72.5° 15:55 | 7.59 | 95% | 164.6° |
| 2039-04-11 Mon | 1 | — | unknown | — | 72.5° 15:50 | 7.53 | 89% | 173.8° |
| 2039-04-12 Tue | 1 | — | unknown | — | 72.5° 15:45 | 7.47 | 80% | 163.3° |
| 2039-04-13 Wed | 1 | — | unknown | — | 72.5° 15:45 | 7.42 | 70% | 149.4° |
| 2039-04-14 Thu | 1 | — | unknown | — | 72.5° 15:40 | 7.36 | 59% | 135.5° |
| 2039-04-15 Fri | 0 | — | unknown | — | 72.5° 15:35 | 7.3 | 48% | 121.8° |
| 2039-04-16 Sat | 0 | — | unknown | — | 72.5° 15:30 | 7.24 | 37% | 108.5° |
| 2039-04-17 Sun | 0 | — | unknown | — | 72.5° 15:30 | 7.19 | 27% | 95.4° |
| 2039-04-18 Mon | 0 | — | unknown | — | 72.5° 15:25 | 7.13 | 19% | 82.5° |
| 2039-04-19 Tue | 0 | — | unknown | — | 72.5° 15:20 | 7.07 | 12% | 69.9° |
| 2039-04-20 Wed | 0 | — | unknown | — | 72.5° 15:15 | 7.01 | 6% | 57.5° |
| 2039-04-21 Thu | 0 | — | unknown | — | 72.5° 15:10 | 6.95 | 2% | 45.3° |
| 2039-04-22 Fri | 0 | — | unknown | — | 72.5° 15:10 | 6.9 | 0% | 33.4° |
| 2039-04-23 Sat | 0 | — | unknown | — | 72.5° 15:05 | 6.84 | 0% | 21.7° |
| 2039-04-24 Sun | 0 | — | unknown | — | 72.5° 15:00 | 6.78 | 2% | 10.8° |
| 2039-04-25 Mon | 0 | — | unknown | — | 72.5° 14:55 | 6.72 | 6% | 6.8° |
| 2039-04-26 Tue | 0 | — | unknown | — | 72.5° 14:50 | 6.66 | 11% | 16.0° |
| 2039-04-27 Wed | 0 | — | unknown | — | 72.5° 14:50 | 6.6 | 17% | 27.3° |
| 2039-04-28 Thu | 0 | — | unknown | — | 72.5° 14:45 | 6.55 | 25% | 38.9° |
| 2039-04-29 Fri | 0 | — | unknown | — | 72.5° 14:40 | 6.49 | 34% | 50.8° |
| 2039-04-30 Sat | 0 | — | unknown | — | 72.5° 14:35 | 6.43 | 43% | 63.0° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2039-04-01&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.