← 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. |
|---|---|---|---|---|---|---|---|---|
| 2041-05-13 Mon | 0 | — | unknown | — | 79.2° 11:25 | 5.67 | 95% | 158.4° |
| 2041-05-14 Tue | 0 | — | unknown | — | 79.2° 11:25 | 5.61 | 99% | 158.9° |
| 2041-05-15 Wed | 0 | — | unknown | — | 79.2° 11:20 | 5.56 | 100% | 152.4° |
| 2041-05-16 Thu | 0 | — | unknown | — | 79.2° 11:15 | 5.51 | 99% | 142.2° |
| 2041-05-17 Fri | 0 | — | unknown | — | 79.2° 11:10 | 5.45 | 96% | 130.4° |
| 2041-05-18 Sat | 0 | — | unknown | — | 79.2° 11:10 | 5.4 | 90% | 117.7° |
| 2041-05-19 Sun | 0 | — | unknown | — | 79.2° 11:05 | 5.35 | 82% | 104.6° |
| 2041-05-20 Mon | 0 | — | unknown | — | 79.2° 11:00 | 5.3 | 72% | 91.4° |
| 2041-05-21 Tue | 0 | — | unknown | — | 79.2° 10:55 | 5.25 | 62% | 78.1° |
| 2041-05-22 Wed | 0 | — | unknown | — | 79.2° 10:50 | 5.2 | 50% | 64.9° |
| 2041-05-23 Thu | 0 | — | unknown | — | 79.2° 10:50 | 5.16 | 39% | 52.0° |
| 2041-05-24 Fri | 0 | — | unknown | — | 79.2° 10:45 | 5.11 | 28% | 39.7° |
| 2041-05-25 Sat | 0 | — | unknown | — | 79.2° 10:40 | 5.07 | 18% | 28.8° |
| 2041-05-26 Sun | 0 | — | unknown | — | 79.2° 10:35 | 5.02 | 10% | 21.5° |
| 2041-05-27 Mon | 0 | — | unknown | — | 79.2° 10:30 | 4.98 | 5% | 21.4° |
| 2041-05-28 Tue | 1 | — | unknown | — | 79.2° 10:30 | 4.94 | 1% | 28.5° |
| 2041-05-29 Wed | 0 | — | unknown | — | 79.2° 10:25 | 4.9 | 0% | 38.6° |
| 2041-05-30 Thu | 1 | — | unknown | — | 79.2° 10:20 | 4.86 | 1% | 49.9° |
| 2041-05-31 Fri | 1 | — | unknown | — | 79.2° 10:15 | 4.82 | 4% | 61.4° |
| 2041-06-01 Sat | 1 | — | unknown | — | 79.2° 10:15 | 4.78 | 9% | 73.0° |
| 2041-06-02 Sun | 1 | — | unknown | — | 79.2° 10:10 | 4.75 | 16% | 84.4° |
| 2041-06-03 Mon | 1 | — | unknown | — | 79.2° 10:05 | 4.71 | 23% | 95.7° |
| 2041-06-04 Tue | 1 | — | unknown | — | 79.2° 10:00 | 4.68 | 32% | 106.8° |
| 2041-06-05 Wed | 2 | — | unknown | 04:30–04:35 (marginal, 0.08 h) | 79.2° 09:55 | 4.65 | 41% | 117.8° |
| 2041-06-06 Thu | 2 | — | unknown | 04:25–04:30 (marginal, 0.08 h) | 79.2° 09:55 | 4.62 | 50% | 128.6° |
| 2041-06-07 Fri | 2 | — | unknown | 04:20–04:30 (marginal, 0.17 h) | 79.2° 09:50 | 4.6 | 60% | 139.0° |
| 2041-06-08 Sat | 2 | — | unknown | 04:20–04:30 (marginal, 0.17 h) | 79.2° 09:45 | 4.57 | 69% | 148.8° |
| 2041-06-09 Sun | 3 | — | unknown | 04:15–04:30 (marginal, 0.25 h) | 79.2° 09:40 | 4.55 | 78% | 156.6° |
| 2041-06-10 Mon | 3 | — | unknown | 04:10–04:30 (marginal, 0.33 h) | 79.2° 09:35 | 4.53 | 86% | 159.6° |
| 2041-06-11 Tue | 3 | — | unknown | 04:05–04:30 (marginal, 0.42 h) | 79.2° 09:35 | 4.51 | 92% | 155.5° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2041-05-13&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.