← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-04-27 Mon | 25 | 84 | 21 | 22:05–03:00 (marginal, 4.92 h) | 50.2° 23:30 | 6.6 | 86% | 13.1° |
| 2026-04-28 Tue | 21 | 65 | 14 | 23:00–00:00 (marginal, 1.0 h) | 50.2° 23:25 | 6.54 | 92% | 7.4° |
| 2026-04-29 Wed | 19 | 45 | 9 | — | 50.2° 23:20 | 6.48 | 97% | 15.8° |
| 2026-04-30 Thu | 21 | 0 | 0 | — | 50.2° 23:15 | 6.42 | 99% | 27.3° |
| 2026-05-01 Fri | 31 | 27 | 8 | 02:00–03:00 (marginal, 1.0 h) | 50.2° 23:10 | 6.36 | 100% | 39.1° |
| 2026-05-02 Sat | 44 | 0 | 0 | — | 50.2° 23:10 | 6.31 | 98% | 50.9° |
| 2026-05-03 Sun | 81 | 35 | 28 | 01:00–03:15 (marginal, 2.25 h) | 50.2° 23:05 | 6.25 | 95% | 62.7° |
| 2026-05-04 Mon | 91 | 2 | 2 | — | 50.2° 23:00 | 6.19 | 91% | 74.4° |
| 2026-05-05 Tue | 93 | 98 | 91 | 22:15–02:25 (good, 4.17 h) | 50.2° 22:55 | 6.13 | 84% | 86.1° |
| 2026-05-06 Wed | 93 | 97 | 90 | 22:20–02:30 (good, 4.17 h) | 50.2° 22:55 | 6.08 | 77% | 97.9° |
| 2026-05-07 Thu | 93 | 56 | 52 | 22:20–01:00 (good, 2.67 h) | 50.2° 22:50 | 6.02 | 69% | 109.7° |
| 2026-05-08 Fri | 93 | 7 | 7 | 02:00–02:25 (marginal, 0.42 h) | 50.2° 22:45 | 5.96 | 59% | 121.7° |
| 2026-05-09 Sat | 93 | 83 | 77 | 22:25–02:35 (good, 4.17 h) | 50.2° 22:40 | 5.91 | 50% | 133.9° |
| 2026-05-10 Sun | 93 | 31 | 29 | 23:00–00:00 (good, 1.0 h) | 50.2° 22:35 | 5.85 | 40% | 146.3° |
| 2026-05-11 Mon | 93 | 51 | 48 | 22:25–00:00 (good, 1.58 h) | 50.2° 22:35 | 5.79 | 30% | 158.9° |
| 2026-05-12 Tue | 93 | 90 | 84 | 22:30–02:15 (good, 3.75 h) | 50.2° 22:30 | 5.74 | 20% | 170.3° |
| 2026-05-13 Wed | 92 | 6 | 5 | 22:30–22:55 (marginal, 0.42 h) | 50.2° 22:25 | 5.68 | 12% | 169.5° |
| 2026-05-14 Thu | 90 | 88 | 79 | 22:30–01:55 (good, 3.42 h) | 50.2° 22:20 | 5.63 | 5% | 156.8° |
| 2026-05-15 Fri | 89 | 85 | 76 | 22:30–01:45 (good, 3.25 h) | 50.2° 22:15 | 5.58 | 1% | 142.5° |
| 2026-05-16 Sat | 86 | 57 | 49 | 01:00–01:45 (good, 0.75 h) | 50.2° 22:15 | 5.52 | 0% | 127.6° |
| 2026-05-17 Sun | 84 | 4 | 3 | — | 50.2° 22:10 | 5.47 | 2% | 112.6° |
| 2026-05-18 Mon | 81 | 1 | 1 | — | 50.2° 22:05 | 5.42 | 7% | 97.6° |
| 2026-05-19 Tue | 75 | 0 | 0 | — | 50.2° 22:00 | 5.37 | 14% | 82.9° |
| 2026-05-20 Wed | 68 | 83 | 57 | 22:40–01:00 (good, 2.33 h) | 50.2° 22:00 | 5.32 | 23% | 68.4° |
| 2026-05-21 Thu | 57 | 22 | 13 | 22:40–00:00 (marginal, 1.33 h) | 50.2° 21:55 | 5.27 | 33% | 54.4° |
| 2026-05-22 Fri | 43 | 10 | 4 | — | 50.2° 21:50 | 5.22 | 44% | 40.9° |
| 2026-05-23 Sat | 32 | 58 | 19 | 23:00–01:55 (marginal, 2.92 h) | 50.2° 21:45 | 5.17 | 55% | 27.9° |
| 2026-05-24 Sun | 25 | 71 | 18 | 23:00–01:50 (marginal, 2.83 h) | 50.2° 21:40 | 5.13 | 65% | 15.8° |
| 2026-05-25 Mon | 19 | 34 | 6 | — | 50.2° 21:40 | 5.08 | 74% | 7.5° |
| 2026-05-26 Tue | 16 | 85 | 14 | 22:50–01:25 (marginal, 2.58 h) | 50.2° 21:35 | 5.04 | 83% | 13.3° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-04-27&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.