← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-05-06 Wed | 1 | 94 | 1 | — | 89.7° 11:05 | 6.08 | 77% | 104.2° |
| 2026-05-07 Thu | 1 | 0 | 0 | — | 89.7° 11:00 | 6.02 | 69% | 93.9° |
| 2026-05-08 Fri | 1 | 25 | 0 | — | 89.6° 10:55 | 5.96 | 59% | 83.3° |
| 2026-05-09 Sat | 2 | 35 | 1 | — | 89.5° 10:55 | 5.91 | 50% | 72.6° |
| 2026-05-10 Sun | 2 | 56 | 1 | — | 89.6° 10:50 | 5.85 | 40% | 61.9° |
| 2026-05-11 Mon | 3 | 0 | 0 | — | 89.7° 10:45 | 5.79 | 30% | 51.3° |
| 2026-05-12 Tue | 3 | 100 | 3 | 04:45–04:55 (marginal, 0.17 h) | 89.7° 10:40 | 5.74 | 20% | 41.4° |
| 2026-05-13 Wed | 4 | 0 | 0 | — | 89.5° 10:35 | 5.68 | 12% | 33.3° |
| 2026-05-14 Thu | 5 | 5 | 0 | — | 89.5° 10:35 | 5.63 | 5% | 29.4° |
| 2026-05-15 Fri | 5 | 10 | 1 | — | 89.7° 10:30 | 5.58 | 1% | 31.7° |
| 2026-05-16 Sat | 5 | 97 | 5 | 04:25–04:50 (marginal, 0.42 h) | 89.7° 10:25 | 5.52 | 0% | 39.5° |
| 2026-05-17 Sun | 6 | 0 | 0 | — | 89.6° 10:20 | 5.47 | 2% | 50.3° |
| 2026-05-18 Mon | 6 | 6 | 0 | — | 89.5° 10:15 | 5.42 | 7% | 62.5° |
| 2026-05-19 Tue | 7 | 0 | 0 | — | 89.6° 10:15 | 5.37 | 14% | 75.2° |
| 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° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-05-06&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.