← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-03-15 Sun | 38 | 100 | 38 | 03:30–05:00 (good, 1.5 h) | 87.3° 09:45 | 8.98 | 11% | 62.2° |
| 2026-03-16 Mon | 39 | 72 | 28 | 03:50–05:00 (good, 1.17 h) | 87.3° 09:40 | 8.93 | 5% | 58.8° |
| 2026-03-17 Tue | 40 | 0 | 0 | — | 87.3° 09:35 | 8.88 | 2% | 57.1° |
| 2026-03-18 Wed | 40 | 0 | 0 | — | 87.3° 09:35 | 8.82 | 0% | 57.5° |
| 2026-03-19 Thu | 42 | 0 | 0 | — | 87.3° 09:30 | 8.77 | 1% | 60.0° |
| 2026-03-20 Fri | 42 | 0 | 0 | — | 87.3° 09:25 | 8.72 | 5% | 64.5° |
| 2026-03-21 Sat | 44 | 0 | 0 | — | 87.3° 09:20 | 8.67 | 11% | 70.5° |
| 2026-03-22 Sun | 44 | 0 | 0 | — | 87.3° 09:20 | 8.62 | 19% | 77.5° |
| 2026-03-23 Mon | 44 | 0 | 0 | — | 87.3° 09:15 | 8.57 | 29% | 85.1° |
| 2026-03-24 Tue | 46 | 0 | 0 | — | 87.3° 09:10 | 8.51 | 40% | 92.8° |
| 2026-03-25 Wed | 47 | 76 | 36 | 02:55–04:00 (good, 1.08 h) | 87.3° 09:05 | 8.46 | 52% | 100.4° |
| 2026-03-26 Thu | 46 | 0 | 0 | — | 87.3° 09:00 | 8.41 | 63% | 107.4° |
| 2026-03-27 Fri | 46 | 11 | 5 | 02:40–03:00 (marginal, 0.33 h) | 87.3° 09:00 | 8.35 | 73% | 113.5° |
| 2026-03-28 Sat | 45 | 0 | 0 | — | 87.3° 09:55 | 8.3 | 82% | 118.3° |
| 2026-03-29 Sun | 42 | 0 | 0 | — | 87.3° 09:50 | 8.25 | 90% | 121.6° |
| 2026-03-30 Mon | 42 | 0 | 0 | — | 87.3° 09:45 | 8.19 | 95% | 123.0° |
| 2026-03-31 Tue | 41 | 0 | 0 | — | 87.3° 09:40 | 8.14 | 99% | 122.4° |
| 2026-04-01 Wed | 42 | 0 | 0 | — | 87.3° 09:40 | 8.08 | 100% | 120.1° |
| 2026-04-02 Thu | 41 | 0 | 0 | — | 87.3° 09:35 | 8.03 | 99% | 116.3° |
| 2026-04-03 Fri | 39 | 0 | 0 | — | 87.3° 09:30 | 7.97 | 96% | 111.4° |
| 2026-04-04 Sat | 39 | 13 | 5 | — | 87.3° 09:25 | 7.92 | 92% | 105.8° |
| 2026-04-05 Sun | 37 | 89 | 33 | 04:00–05:20 (good, 1.33 h) | 87.3° 09:25 | 7.86 | 86% | 99.7° |
| 2026-04-06 Mon | 38 | 89 | 34 | 03:25–05:00 (good, 1.58 h) | 87.3° 09:20 | 7.8 | 79% | 93.3° |
| 2026-04-07 Tue | 39 | 68 | 27 | 05:00–05:20 (good, 0.33 h) | 87.3° 09:15 | 7.75 | 71% | 86.9° |
| 2026-04-08 Wed | 41 | 1 | 0 | — | 87.3° 09:10 | 7.69 | 62% | 80.5° |
| 2026-04-09 Thu | 45 | 10 | 5 | 02:30–03:00 (marginal, 0.5 h) | 87.3° 09:05 | 7.64 | 53% | 74.4° |
| 2026-04-10 Fri | 50 | 0 | 0 | — | 87.3° 09:05 | 7.58 | 43% | 68.7° |
| 2026-04-11 Sat | 55 | 3 | 2 | — | 87.3° 09:00 | 7.52 | 33% | 63.8° |
| 2026-04-12 Sun | 60 | 0 | 0 | — | 87.3° 08:55 | 7.47 | 24% | 59.9° |
| 2026-04-13 Mon | 62 | 0 | 0 | — | 87.3° 08:50 | 7.41 | 16% | 57.5° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-03-15&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.