← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-04-30 Thu | 48 | 0 | 0 | — | 71.1° 06:45 | 6.42 | 99% | 98.0° |
| 2026-05-01 Fri | 42 | 78 | 33 | 02:50–04:00 (good, 1.17 h) | 71.1° 06:45 | 6.36 | 100% | 89.4° |
| 2026-05-02 Sat | 39 | 0 | 0 | — | 71.1° 06:40 | 6.31 | 98% | 80.8° |
| 2026-05-03 Sun | 37 | 96 | 36 | 03:25–04:30 (good, 1.08 h) | 71.1° 06:35 | 6.25 | 95% | 72.5° |
| 2026-05-04 Mon | 35 | 41 | 14 | 03:00–04:25 (marginal, 1.42 h) | 71.1° 06:30 | 6.19 | 91% | 64.7° |
| 2026-05-05 Tue | 36 | 100 | 36 | 03:05–04:25 (good, 1.33 h) | 71.1° 06:25 | 6.13 | 84% | 57.6° |
| 2026-05-06 Wed | 38 | 98 | 37 | 02:20–04:00 (good, 1.67 h) | 71.1° 06:25 | 6.08 | 77% | 51.6° |
| 2026-05-07 Thu | 52 | 3 | 1 | 00:50–01:00 (marginal, 0.17 h) | 71.1° 06:20 | 6.02 | 69% | 47.1° |
| 2026-05-08 Fri | 60 | 25 | 15 | 02:00–03:00 (marginal, 1.0 h) | 71.1° 06:15 | 5.96 | 59% | 44.6° |
| 2026-05-09 Sat | 67 | 82 | 55 | 01:15–04:00 (good, 2.75 h) | 71.1° 06:10 | 5.91 | 50% | 44.7° |
| 2026-05-10 Sun | 74 | 49 | 36 | 02:00–03:00 (good, 1.0 h) | 71.1° 06:05 | 5.85 | 40% | 47.6° |
| 2026-05-11 Mon | 80 | 3 | 3 | 00:55–01:00 (marginal, 0.08 h) | 71.1° 06:05 | 5.79 | 30% | 52.9° |
| 2026-05-12 Tue | 85 | 96 | 81 | 01:05–04:10 (good, 3.08 h) | 71.1° 06:00 | 5.74 | 20% | 60.2° |
| 2026-05-13 Wed | 89 | 0 | 0 | — | 71.1° 05:55 | 5.68 | 12% | 69.0° |
| 2026-05-14 Thu | 90 | 56 | 51 | 01:10–02:00 (good, 0.83 h) | 71.1° 05:50 | 5.63 | 5% | 79.0° |
| 2026-05-15 Fri | 90 | 55 | 50 | 01:10–02:00 (good, 0.83 h) | 71.1° 05:50 | 5.58 | 1% | 89.5° |
| 2026-05-16 Sat | 92 | 86 | 79 | 01:00–04:05 (good, 3.08 h) | 71.1° 05:45 | 5.52 | 0% | 100.3° |
| 2026-05-17 Sun | 94 | 0 | 0 | — | 71.1° 05:40 | 5.47 | 2% | 110.7° |
| 2026-05-18 Mon | 94 | 5 | 5 | — | 71.1° 05:35 | 5.42 | 7% | 120.3° |
| 2026-05-19 Tue | 94 | 0 | 0 | — | 71.1° 05:30 | 5.37 | 14% | 128.2° |
| 2026-05-20 Wed | 96 | 67 | 64 | 01:20–02:00 (good, 0.67 h) | 71.1° 05:30 | 5.32 | 23% | 133.6° |
| 2026-05-21 Thu | 97 | 2 | 2 | — | 71.1° 05:25 | 5.27 | 33% | 135.8° |
| 2026-05-22 Fri | 97 | 6 | 5 | — | 71.1° 05:20 | 5.22 | 44% | 134.5° |
| 2026-05-23 Sat | 97 | 44 | 43 | 01:00–02:00 (good, 1.0 h) | 71.1° 05:15 | 5.17 | 55% | 130.4° |
| 2026-05-24 Sun | 97 | 86 | 84 | 01:00–03:55 (good, 2.92 h) | 71.1° 05:10 | 5.13 | 65% | 124.2° |
| 2026-05-25 Mon | 96 | 44 | 42 | 02:40–03:00 (good, 0.33 h) | 71.1° 05:10 | 5.08 | 74% | 116.8° |
| 2026-05-26 Tue | 93 | 80 | 74 | 00:35–03:00 (good, 2.42 h) | 71.1° 05:05 | 5.04 | 83% | 108.7° |
| 2026-05-27 Wed | 89 | 76 | 68 | 03:00–03:50 (good, 0.83 h) | 71.1° 05:00 | 4.99 | 89% | 100.2° |
| 2026-05-28 Thu | 69 | 99 | 69 | 00:35–03:50 (good, 3.25 h) | 71.1° 04:55 | 4.95 | 94% | 91.5° |
| 2026-05-29 Fri | 61 | 92 | 56 | 01:55–03:50 (good, 1.92 h) | 71.1° 04:55 | 4.91 | 98% | 83.0° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-04-30&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.