← 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. |
|---|---|---|---|---|---|---|---|---|
| 2037-08-20 Thu | 1 | — | unknown | — | 42.9° 09:00 | 6.95 | 79% | 151.8° |
| 2037-08-21 Fri | 1 | — | unknown | — | 42.9° 08:55 | 7.01 | 86% | 144.8° |
| 2037-08-22 Sat | 1 | — | unknown | — | 42.9° 08:50 | 7.06 | 92% | 135.7° |
| 2037-08-23 Sun | 2 | — | unknown | — | 42.9° 08:45 | 7.12 | 97% | 125.7° |
| 2037-08-24 Mon | 2 | — | unknown | — | 42.9° 08:45 | 7.18 | 99% | 115.2° |
| 2037-08-25 Tue | 2 | — | unknown | 04:55–05:05 (marginal, 0.17 h) | 42.9° 08:40 | 7.24 | 100% | 104.6° |
| 2037-08-26 Wed | 2 | — | unknown | 04:50–05:05 (marginal, 0.25 h) | 42.9° 08:35 | 7.29 | 99% | 93.9° |
| 2037-08-27 Thu | 2 | — | unknown | 04:55–05:05 (marginal, 0.17 h) | 42.9° 08:30 | 7.35 | 96% | 83.2° |
| 2037-08-28 Fri | 3 | — | unknown | 04:55–05:05 (marginal, 0.17 h) | 42.9° 08:25 | 7.41 | 91% | 72.6° |
| 2037-08-29 Sat | 3 | — | unknown | 05:00–05:10 (marginal, 0.17 h) | 42.9° 08:25 | 7.46 | 85% | 62.2° |
| 2037-08-30 Sun | 3 | — | unknown | 05:00–05:10 (marginal, 0.17 h) | 42.9° 08:20 | 7.52 | 78% | 52.0° |
| 2037-08-31 Mon | 3 | — | unknown | 04:55–05:10 (marginal, 0.25 h) | 42.9° 08:15 | 7.57 | 69% | 42.3° |
| 2037-09-01 Tue | 4 | — | unknown | 04:45–05:10 (marginal, 0.42 h) | 42.9° 08:10 | 7.63 | 60% | 33.6° |
| 2037-09-02 Wed | 6 | — | unknown | 04:30–05:15 (marginal, 0.75 h) | 42.9° 08:05 | 7.69 | 50% | 27.4° |
| 2037-09-03 Thu | 8 | — | unknown | 04:20–05:15 (marginal, 0.92 h) | 42.9° 08:05 | 7.74 | 40% | 25.8° |
| 2037-09-04 Fri | 11 | — | unknown | 05:10–05:15 (good, 0.08 h) | 42.9° 08:00 | 7.8 | 29% | 30.0° |
| 2037-09-05 Sat | 16 | — | unknown | 04:50–05:20 (good, 0.5 h) | 42.9° 07:55 | 7.85 | 20% | 38.6° |
| 2037-09-06 Sun | 20 | — | unknown | 04:40–05:20 (good, 0.67 h) | 42.9° 07:50 | 7.91 | 12% | 49.7° |
| 2037-09-07 Mon | 22 | — | unknown | 04:35–05:20 (good, 0.75 h) | 42.9° 07:50 | 7.96 | 5% | 62.2° |
| 2037-09-08 Tue | 24 | — | unknown | 04:30–05:20 (good, 0.83 h) | 42.9° 07:45 | 8.02 | 1% | 75.5° |
| 2037-09-09 Wed | 26 | — | unknown | 04:25–05:25 (good, 1.0 h) | 42.9° 07:40 | 8.07 | 0% | 89.2° |
| 2037-09-10 Thu | 28 | — | unknown | 04:20–05:25 (good, 1.08 h) | 42.9° 07:35 | 8.12 | 2% | 102.9° |
| 2037-09-11 Fri | 30 | — | unknown | 04:20–05:25 (good, 1.08 h) | 42.9° 07:30 | 8.18 | 7% | 116.3° |
| 2037-09-12 Sat | 31 | — | unknown | 04:15–05:25 (good, 1.17 h) | 42.9° 07:30 | 8.23 | 15% | 129.0° |
| 2037-09-13 Sun | 33 | — | unknown | 04:10–05:30 (good, 1.33 h) | 42.9° 07:25 | 8.28 | 24% | 140.3° |
| 2037-09-14 Mon | 35 | — | unknown | 04:05–05:30 (good, 1.42 h) | 42.9° 07:20 | 8.34 | 34% | 149.3° |
| 2037-09-15 Tue | 36 | — | unknown | 04:00–05:30 (good, 1.5 h) | 42.9° 07:15 | 8.39 | 45% | 154.0° |
| 2037-09-16 Wed | 38 | — | unknown | 04:00–05:30 (good, 1.5 h) | 42.9° 07:10 | 8.44 | 55% | 152.8° |
| 2037-09-17 Thu | 40 | — | unknown | 03:55–05:35 (good, 1.67 h) | 42.9° 07:10 | 8.49 | 65% | 146.6° |
| 2037-09-18 Fri | 42 | — | unknown | 03:50–05:35 (good, 1.75 h) | 42.9° 07:05 | 8.55 | 74% | 137.9° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2037-08-20&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.