← 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. |
|---|---|---|---|---|---|---|---|---|
| 2036-05-18 Sun | 0 | — | unknown | — | 79.1° 11:05 | 5.39 | 45% | 60.9° |
| 2036-05-19 Mon | 0 | — | unknown | — | 79.1° 11:05 | 5.34 | 35% | 50.4° |
| 2036-05-20 Tue | 0 | — | unknown | — | 79.1° 11:00 | 5.29 | 26% | 40.2° |
| 2036-05-21 Wed | 0 | — | unknown | — | 79.2° 10:55 | 5.24 | 18% | 31.3° |
| 2036-05-22 Thu | 0 | — | unknown | — | 79.2° 10:50 | 5.19 | 10% | 25.2° |
| 2036-05-23 Fri | 0 | — | unknown | — | 79.1° 10:45 | 5.15 | 5% | 24.9° |
| 2036-05-24 Sat | 0 | — | unknown | — | 79.1° 10:45 | 5.1 | 1% | 31.0° |
| 2036-05-25 Sun | 0 | — | unknown | — | 79.2° 10:40 | 5.06 | 0% | 41.0° |
| 2036-05-26 Mon | 0 | — | unknown | — | 79.2° 10:35 | 5.01 | 2% | 53.0° |
| 2036-05-27 Tue | 0 | — | unknown | — | 79.1° 10:30 | 4.97 | 6% | 65.8° |
| 2036-05-28 Wed | 1 | — | unknown | — | 79.1° 10:25 | 4.93 | 13% | 79.1° |
| 2036-05-29 Thu | 1 | — | unknown | — | 79.1° 10:25 | 4.89 | 22% | 92.4° |
| 2036-05-30 Fri | 1 | — | unknown | — | 79.2° 10:20 | 4.85 | 33% | 105.5° |
| 2036-05-31 Sat | 1 | — | unknown | — | 79.2° 10:15 | 4.81 | 44% | 118.2° |
| 2036-06-01 Sun | 1 | — | unknown | — | 79.1° 10:10 | 4.78 | 55% | 130.3° |
| 2036-06-02 Mon | 1 | — | unknown | — | 79.1° 10:10 | 4.74 | 66% | 141.4° |
| 2036-06-03 Tue | 1 | — | unknown | — | 79.1° 10:05 | 4.71 | 76% | 150.4° |
| 2036-06-04 Wed | 2 | — | unknown | 04:30–04:35 (marginal, 0.08 h) | 79.2° 10:00 | 4.68 | 84% | 155.4° |
| 2036-06-05 Thu | 2 | — | unknown | 04:30–04:35 (marginal, 0.08 h) | 79.2° 09:55 | 4.65 | 91% | 154.4° |
| 2036-06-06 Fri | 2 | — | unknown | — | 79.1° 09:50 | 4.62 | 96% | 148.1° |
| 2036-06-07 Sat | 2 | — | unknown | — | 79.1° 09:50 | 4.59 | 99% | 139.0° |
| 2036-06-08 Sun | 2 | — | unknown | 04:25–04:30 (marginal, 0.08 h) | 79.2° 09:45 | 4.57 | 100% | 128.8° |
| 2036-06-09 Mon | 2 | — | unknown | 04:25–04:30 (marginal, 0.08 h) | 79.2° 09:40 | 4.54 | 99% | 118.2° |
| 2036-06-10 Tue | 2 | — | unknown | 04:25–04:30 (marginal, 0.08 h) | 79.2° 09:35 | 4.52 | 96% | 107.4° |
| 2036-06-11 Wed | 2 | — | unknown | 03:35–03:40 (marginal, 0.08 h) | 79.1° 09:30 | 4.5 | 91% | 96.5° |
| 2036-06-12 Thu | 3 | — | unknown | 03:30–03:40 (marginal, 0.17 h) | 79.1° 09:30 | 4.49 | 85% | 85.7° |
| 2036-06-13 Fri | 3 | — | unknown | 03:30–03:40 (marginal, 0.17 h) | 79.2° 09:25 | 4.47 | 78% | 74.9° |
| 2036-06-14 Sat | 3 | — | unknown | 03:25–03:40 (marginal, 0.25 h) | 79.2° 09:20 | 4.46 | 70% | 64.3° |
| 2036-06-15 Sun | 4 | — | unknown | 03:20–03:40 (marginal, 0.33 h) | 79.1° 09:15 | 4.45 | 61% | 53.8° |
| 2036-06-16 Mon | 5 | — | unknown | 03:15–03:40 (marginal, 0.42 h) | 79.1° 09:15 | 4.44 | 51% | 43.7° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2036-05-18&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.