← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-04-20 Mon | 69 | 92 | 64 | 02:10–04:50 (good, 2.67 h) | 87.2° 08:25 | 7.0 | 16% | 90.6° |
| 2026-04-21 Tue | 71 | 0 | 0 | — | 87.3° 08:20 | 6.95 | 26% | 98.5° |
| 2026-04-22 Wed | 71 | 0 | 0 | — | 87.3° 08:15 | 6.89 | 37% | 105.8° |
| 2026-04-23 Thu | 71 | 61 | 43 | 02:10–04:00 (good, 1.83 h) | 87.2° 08:10 | 6.83 | 48% | 112.3° |
| 2026-04-24 Fri | 71 | 89 | 63 | 03:25–04:45 (good, 1.33 h) | 87.2° 08:10 | 6.77 | 59% | 117.4° |
| 2026-04-25 Sat | 72 | 97 | 70 | 02:05–04:45 (good, 2.67 h) | 87.3° 08:05 | 6.71 | 69% | 121.0° |
| 2026-04-26 Sun | 71 | 100 | 71 | 01:55–04:40 (good, 2.75 h) | 87.3° 08:00 | 6.65 | 78% | 122.8° |
| 2026-04-27 Mon | 72 | 64 | 46 | 02:20–03:00 (good, 0.67 h) | 87.3° 07:55 | 6.6 | 86% | 122.7° |
| 2026-04-28 Tue | 65 | 60 | 39 | 04:00–04:35 (good, 0.58 h) | 87.2° 07:50 | 6.54 | 92% | 120.9° |
| 2026-04-29 Wed | 63 | 21 | 13 | 01:25–02:00 (marginal, 0.58 h) | 87.2° 07:50 | 6.48 | 97% | 117.5° |
| 2026-04-30 Thu | 61 | 0 | 0 | — | 87.3° 07:45 | 6.42 | 99% | 112.9° |
| 2026-05-01 Fri | 57 | 74 | 42 | 02:00–04:00 (good, 2.0 h) | 87.3° 07:40 | 6.36 | 100% | 107.4° |
| 2026-05-02 Sat | 54 | 0 | 0 | — | 87.2° 07:35 | 6.31 | 98% | 101.4° |
| 2026-05-03 Sun | 52 | 92 | 48 | 02:00–04:30 (good, 2.5 h) | 87.2° 07:30 | 6.25 | 95% | 95.1° |
| 2026-05-04 Mon | 50 | 38 | 19 | 04:00–04:25 (good, 0.42 h) | 87.2° 07:30 | 6.19 | 91% | 88.7° |
| 2026-05-05 Tue | 50 | 100 | 50 | 01:35–04:25 (good, 2.83 h) | 87.3° 07:25 | 6.13 | 84% | 82.3° |
| 2026-05-06 Wed | 53 | 98 | 52 | 01:30–04:20 (good, 2.83 h) | 87.3° 07:20 | 6.08 | 77% | 76.1° |
| 2026-05-07 Thu | 62 | 9 | 6 | 00:25–01:00 (marginal, 0.58 h) | 87.2° 07:15 | 6.02 | 69% | 70.3° |
| 2026-05-08 Fri | 68 | 23 | 16 | 02:00–04:00 (marginal, 2.0 h) | 87.2° 07:15 | 5.96 | 59% | 65.2° |
| 2026-05-09 Sat | 74 | 82 | 61 | 01:00–04:00 (good, 3.0 h) | 87.3° 07:10 | 5.91 | 50% | 61.0° |
| 2026-05-10 Sun | 81 | 45 | 37 | 02:00–03:00 (good, 1.0 h) | 87.3° 07:05 | 5.85 | 40% | 58.1° |
| 2026-05-11 Mon | 86 | 7 | 6 | 00:40–01:00 (marginal, 0.33 h) | 87.3° 07:00 | 5.79 | 30% | 56.9° |
| 2026-05-12 Tue | 91 | 96 | 87 | 00:45–04:10 (good, 3.42 h) | 87.2° 06:55 | 5.74 | 20% | 57.6° |
| 2026-05-13 Wed | 95 | 0 | 0 | — | 87.2° 06:55 | 5.68 | 12% | 60.5° |
| 2026-05-14 Thu | 97 | 59 | 57 | 00:35–02:00 (good, 1.42 h) | 87.3° 06:50 | 5.63 | 5% | 65.3° |
| 2026-05-15 Fri | 97 | 57 | 55 | 00:50–02:00 (good, 1.17 h) | 87.3° 06:45 | 5.58 | 1% | 71.8° |
| 2026-05-16 Sat | 99 | 84 | 83 | 01:00–04:05 (good, 3.08 h) | 87.2° 06:40 | 5.52 | 0% | 79.4° |
| 2026-05-17 Sun | 100 | 0 | 0 | — | 87.2° 06:35 | 5.47 | 2% | 87.5° |
| 2026-05-18 Mon | 100 | 5 | 5 | — | 87.2° 06:35 | 5.42 | 7% | 95.8° |
| 2026-05-19 Tue | 100 | 0 | 0 | — | 87.3° 06:30 | 5.37 | 14% | 103.6° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-04-20&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.