← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-05-20 Wed | 8 | 66 | 5 | 03:50–04:00 (marginal, 0.17 h) | 89.7° 10:10 | 5.32 | 23% | 87.9° |
| 2026-05-21 Thu | 9 | 9 | 1 | — | 89.7° 10:05 | 5.27 | 33% | 100.2° |
| 2026-05-22 Fri | 9 | 0 | 0 | — | 89.6° 10:00 | 5.22 | 44% | 112.0° |
| 2026-05-23 Sat | 10 | 4 | 0 | — | 89.5° 10:00 | 5.17 | 55% | 123.1° |
| 2026-05-24 Sun | 11 | 88 | 10 | 03:15–04:00 (marginal, 0.75 h) | 89.6° 09:55 | 5.13 | 65% | 133.3° |
| 2026-05-25 Mon | 12 | 34 | 4 | — | 89.7° 09:50 | 5.08 | 74% | 141.9° |
| 2026-05-26 Tue | 12 | 75 | 9 | 04:00–04:40 (marginal, 0.67 h) | 89.7° 09:45 | 5.04 | 83% | 148.2° |
| 2026-05-27 Wed | 13 | 94 | 12 | 03:45–03:50 (good, 0.08 h) | 89.5° 09:40 | 4.99 | 89% | 150.7° |
| 2026-05-28 Thu | 13 | 100 | 13 | 03:45–03:50 (good, 0.08 h) | 89.5° 09:40 | 4.95 | 94% | 148.8° |
| 2026-05-29 Fri | 13 | 98 | 13 | 03:40–03:50 (good, 0.17 h) | 89.7° 09:35 | 4.91 | 98% | 143.3° |
| 2026-05-30 Sat | 13 | 75 | 10 | 02:55–03:45 (marginal, 0.83 h) | 89.7° 09:30 | 4.87 | 100% | 135.5° |
| 2026-05-31 Sun | 14 | 98 | 14 | 03:35–03:45 (good, 0.17 h) | 89.6° 09:25 | 4.83 | 100% | 126.5° |
| 2026-06-01 Mon | 15 | 25 | 4 | — | 89.5° 09:20 | 4.79 | 98% | 116.8° |
| 2026-06-02 Tue | 15 | 86 | 13 | 02:45–04:00 (marginal, 1.25 h) | 89.6° 09:20 | 4.76 | 94% | 106.8° |
| 2026-06-03 Wed | 14 | 43 | 6 | — | 89.7° 09:15 | 4.73 | 89% | 96.5° |
| 2026-06-04 Thu | 14 | 10 | 1 | — | 89.7° 09:10 | 4.69 | 82% | 86.0° |
| 2026-06-05 Fri | 14 | 86 | 12 | 02:40–03:40 (marginal, 1.0 h) | 89.6° 09:05 | 4.66 | 74% | 75.4° |
| 2026-06-06 Sat | 14 | 69 | 10 | 03:00–03:40 (marginal, 0.67 h) | 89.5° 09:05 | 4.63 | 65% | 64.8° |
| 2026-06-07 Sun | 15 | 97 | 15 | 02:20–03:40 (marginal, 1.33 h) | 89.6° 09:00 | 4.61 | 55% | 54.4° |
| 2026-06-08 Mon | 17 | 1 | 0 | — | 89.7° 08:55 | 4.58 | 45% | 44.5° |
| 2026-06-09 Tue | 20 | 98 | 20 | 03:05–03:40 (good, 0.58 h) | 89.7° 08:50 | 4.56 | 34% | 35.8° |
| 2026-06-10 Wed | 24 | 99 | 24 | 02:55–03:40 (good, 0.75 h) | 89.5° 08:45 | 4.53 | 24% | 30.1° |
| 2026-06-11 Thu | 28 | 10 | 3 | — | 89.5° 08:45 | 4.51 | 15% | 29.8° |
| 2026-06-12 Fri | 32 | 0 | 0 | — | 89.7° 08:40 | 4.49 | 7% | 35.5° |
| 2026-06-13 Sat | 34 | 94 | 32 | 02:40–03:40 (good, 1.0 h) | 89.7° 08:35 | 4.48 | 2% | 45.3° |
| 2026-06-14 Sun | 35 | 91 | 32 | 02:55–03:40 (good, 0.75 h) | 89.6° 08:30 | 4.46 | 0% | 57.1° |
| 2026-06-15 Mon | 37 | 61 | 23 | 03:00–03:40 (good, 0.67 h) | 89.5° 08:25 | 4.45 | 1% | 69.8° |
| 2026-06-16 Tue | 38 | 0 | 0 | — | 89.6° 08:25 | 4.44 | 5% | 82.9° |
| 2026-06-17 Wed | 39 | 67 | 26 | 03:00–03:40 (good, 0.67 h) | 89.7° 08:20 | 4.43 | 12% | 95.8° |
| 2026-06-18 Thu | 41 | 69 | 28 | 02:30–03:40 (good, 1.17 h) | 89.7° 08:15 | 4.43 | 20% | 108.2° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-05-20&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.