← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-05-18 Mon | 100 | 5 | 5 | — | 87.3° 06:35 | 5.42 | 7% | 95.8° |
| 2026-05-19 Tue | 100 | 0 | 0 | — | 87.3° 06:30 | 5.37 | 14% | 103.7° |
| 2026-05-20 Wed | 100 | 68 | 68 | 01:15–02:00 (good, 0.75 h) | 87.3° 06:25 | 5.32 | 23% | 110.7° |
| 2026-05-21 Thu | 100 | 4 | 4 | — | 87.3° 06:20 | 5.27 | 33% | 116.5° |
| 2026-05-22 Fri | 100 | 5 | 5 | — | 87.3° 06:20 | 5.22 | 44% | 120.6° |
| 2026-05-23 Sat | 100 | 45 | 45 | 01:00–02:00 (good, 1.0 h) | 87.3° 06:15 | 5.17 | 55% | 122.9° |
| 2026-05-24 Sun | 100 | 85 | 85 | 01:00–03:55 (good, 2.92 h) | 87.3° 06:10 | 5.13 | 65% | 123.2° |
| 2026-05-25 Mon | 100 | 43 | 43 | 02:40–03:00 (good, 0.33 h) | 87.3° 06:05 | 5.08 | 74% | 121.7° |
| 2026-05-26 Tue | 100 | 80 | 80 | 00:15–03:00 (good, 2.75 h) | 87.3° 06:00 | 5.04 | 83% | 118.6° |
| 2026-05-27 Wed | 100 | 77 | 77 | 03:00–03:50 (good, 0.83 h) | 87.3° 06:00 | 4.99 | 89% | 114.2° |
| 2026-05-28 Thu | 86 | 99 | 85 | 00:00–03:50 (good, 3.83 h) | 87.3° 05:55 | 4.95 | 94% | 108.9° |
| 2026-05-29 Fri | 79 | 92 | 72 | 01:00–03:50 (good, 2.83 h) | 87.3° 05:50 | 4.91 | 98% | 103.0° |
| 2026-05-30 Sat | 73 | 65 | 48 | 02:00–03:45 (good, 1.75 h) | 87.3° 05:45 | 4.87 | 100% | 96.7° |
| 2026-05-31 Sun | 67 | 96 | 64 | 00:40–03:45 (good, 3.08 h) | 87.3° 05:40 | 4.83 | 100% | 90.2° |
| 2026-06-01 Mon | 63 | 31 | 20 | 23:00–01:00 (marginal, 2.0 h) | 87.3° 05:40 | 4.79 | 98% | 83.8° |
| 2026-06-02 Tue | 61 | 88 | 54 | 03:00–03:45 (good, 0.75 h) | 87.3° 05:35 | 4.76 | 94% | 77.4° |
| 2026-06-03 Wed | 72 | 72 | 52 | 23:20–00:00 (good, 0.67 h) | 87.3° 05:30 | 4.73 | 89% | 71.5° |
| 2026-06-04 Thu | 79 | 38 | 30 | 23:30–00:25 (good, 0.92 h) | 87.3° 05:25 | 4.69 | 82% | 66.2° |
| 2026-06-05 Fri | 86 | 78 | 67 | 02:00–03:00 (good, 1.0 h) | 87.3° 05:25 | 4.66 | 74% | 61.7° |
| 2026-06-06 Sat | 90 | 72 | 65 | 23:25–01:00 (good, 1.58 h) | 87.3° 05:20 | 4.63 | 65% | 58.4° |
| 2026-06-07 Sun | 94 | 95 | 89 | 23:15–03:40 (good, 4.42 h) | 87.3° 05:15 | 4.61 | 55% | 56.7° |
| 2026-06-08 Mon | 96 | 0 | 0 | — | 87.3° 05:10 | 4.58 | 45% | 56.8° |
| 2026-06-09 Tue | 99 | 98 | 97 | 23:05–03:40 (good, 4.58 h) | 87.3° 05:05 | 4.56 | 34% | 59.0° |
| 2026-06-10 Wed | 100 | 95 | 95 | 23:05–03:40 (good, 4.58 h) | 87.3° 05:05 | 4.53 | 24% | 63.0° |
| 2026-06-11 Thu | 100 | 48 | 48 | 23:10–02:00 (good, 2.83 h) | 87.3° 05:00 | 4.51 | 15% | 68.8° |
| 2026-06-12 Fri | 100 | 0 | 0 | — | 87.3° 04:55 | 4.49 | 7% | 75.9° |
| 2026-06-13 Sat | 100 | 94 | 94 | 23:10–03:40 (good, 4.5 h) | 87.3° 04:50 | 4.48 | 2% | 83.9° |
| 2026-06-14 Sun | 100 | 91 | 91 | 23:10–03:40 (good, 4.5 h) | 87.3° 04:45 | 4.46 | 0% | 92.2° |
| 2026-06-15 Mon | 100 | 64 | 64 | 02:00–03:40 (good, 1.67 h) | 87.3° 04:45 | 4.45 | 1% | 100.5° |
| 2026-06-16 Tue | 100 | 0 | 0 | — | 87.3° 04:40 | 4.44 | 5% | 108.2° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-05-18&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.