← 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. |
|---|---|---|---|---|---|---|---|---|
| 2030-04-21 Sun | 0 | — | unknown | — | 89.5° 12:05 | 6.94 | 80% | 116.7° |
| 2030-04-22 Mon | 0 | — | unknown | — | 89.7° 12:00 | 6.89 | 70% | 104.4° |
| 2030-04-23 Tue | 0 | — | unknown | — | 89.7° 12:00 | 6.83 | 59% | 92.3° |
| 2030-04-24 Wed | 0 | — | unknown | — | 89.6° 11:50 | 6.77 | 48% | 80.5° |
| 2030-04-25 Thu | 0 | — | unknown | — | 89.5° 11:50 | 6.71 | 38% | 69.1° |
| 2030-04-26 Fri | 0 | — | unknown | — | 89.7° 11:45 | 6.65 | 28% | 58.3° |
| 2030-04-27 Sat | 1 | — | unknown | — | 89.7° 11:40 | 6.59 | 20% | 48.4° |
| 2030-04-28 Sun | 1 | — | unknown | — | 89.7° 11:35 | 6.54 | 12% | 39.6° |
| 2030-04-29 Mon | 1 | — | unknown | — | 89.5° 11:30 | 6.48 | 7% | 33.0° |
| 2030-04-30 Tue | 1 | — | unknown | — | 89.6° 11:30 | 6.42 | 3% | 29.6° |
| 2030-05-01 Wed | 1 | — | unknown | — | 89.7° 11:25 | 6.36 | 0% | 30.5° |
| 2030-05-02 Thu | 1 | — | unknown | — | 89.7° 11:20 | 6.3 | 0% | 35.2° |
| 2030-05-03 Fri | 1 | — | unknown | — | 89.6° 11:15 | 6.25 | 2% | 42.5° |
| 2030-05-04 Sat | 1 | — | unknown | — | 89.5° 11:10 | 6.19 | 5% | 51.2° |
| 2030-05-05 Sun | 2 | — | unknown | — | 89.6° 11:10 | 6.13 | 10% | 60.7° |
| 2030-05-06 Mon | 2 | — | unknown | 05:00–05:05 (marginal, 0.08 h) | 89.7° 11:05 | 6.07 | 16% | 70.7° |
| 2030-05-07 Tue | 2 | — | unknown | 04:55–05:05 (marginal, 0.17 h) | 89.7° 11:00 | 6.02 | 24% | 81.1° |
| 2030-05-08 Wed | 2 | — | unknown | 04:55–05:00 (marginal, 0.08 h) | 89.6° 10:55 | 5.96 | 32% | 91.7° |
| 2030-05-09 Thu | 2 | — | unknown | 04:50–05:00 (marginal, 0.17 h) | 89.5° 10:55 | 5.9 | 42% | 102.5° |
| 2030-05-10 Fri | 3 | — | unknown | 04:45–05:00 (marginal, 0.25 h) | 89.7° 10:50 | 5.85 | 52% | 113.4° |
| 2030-05-11 Sat | 3 | — | unknown | 04:40–04:55 (marginal, 0.25 h) | 89.7° 10:45 | 5.79 | 63% | 124.3° |
| 2030-05-12 Sun | 3 | — | unknown | 04:35–04:55 (marginal, 0.33 h) | 89.7° 10:40 | 5.74 | 73% | 134.7° |
| 2030-05-13 Mon | 4 | — | unknown | 04:35–04:55 (marginal, 0.33 h) | 89.5° 10:35 | 5.68 | 82% | 143.9° |
| 2030-05-14 Tue | 4 | — | unknown | 04:30–04:55 (marginal, 0.42 h) | 89.6° 10:35 | 5.63 | 90% | 149.8° |
| 2030-05-15 Wed | 4 | — | unknown | 03:50–04:05 (marginal, 0.25 h) | 89.7° 10:30 | 5.58 | 96% | 149.8° |
| 2030-05-16 Thu | 4 | — | unknown | 04:30–04:50 (marginal, 0.33 h) | 89.7° 10:25 | 5.52 | 100% | 143.6° |
| 2030-05-17 Fri | 5 | — | unknown | 03:45–04:05 (marginal, 0.33 h) | 89.6° 10:20 | 5.47 | 100% | 133.6° |
| 2030-05-18 Sat | 5 | — | unknown | 04:25–04:50 (marginal, 0.42 h) | 89.5° 10:15 | 5.42 | 97% | 121.7° |
| 2030-05-19 Sun | 5 | — | unknown | 03:35–04:00 (marginal, 0.42 h) | 89.6° 10:15 | 5.37 | 91% | 109.1° |
| 2030-05-20 Mon | 5 | — | unknown | 03:35–04:00 (marginal, 0.42 h) | 89.7° 10:10 | 5.32 | 83% | 96.5° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2030-04-21&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.