← 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. |
|---|---|---|---|---|---|---|---|---|
| 2036-04-18 Fri | 0 | — | unknown | — | 89.5° 12:15 | 7.09 | 47% | 84.6° |
| 2036-04-19 Sat | 0 | — | unknown | — | 89.6° 12:15 | 7.03 | 37% | 75.3° |
| 2036-04-20 Sun | 0 | — | unknown | — | 89.8° 12:10 | 6.97 | 28% | 66.2° |
| 2036-04-21 Mon | 0 | — | unknown | — | 89.7° 12:05 | 6.91 | 20% | 57.5° |
| 2036-04-22 Tue | 0 | — | unknown | — | 89.6° 12:00 | 6.85 | 13% | 49.6° |
| 2036-04-23 Wed | 0 | — | unknown | — | 89.7° 11:55 | 6.8 | 7% | 43.0° |
| 2036-04-24 Thu | 0 | — | unknown | — | 89.8° 11:50 | 6.74 | 3% | 38.8° |
| 2036-04-25 Fri | 0 | — | unknown | — | 89.7° 11:45 | 6.68 | 0% | 38.1° |
| 2036-04-26 Sat | 1 | — | unknown | — | 89.5° 11:40 | 6.62 | 0% | 41.3° |
| 2036-04-27 Sun | 1 | — | unknown | — | 89.6° 11:40 | 6.56 | 3% | 47.8° |
| 2036-04-28 Mon | 1 | — | unknown | — | 89.7° 11:35 | 6.5 | 8% | 56.5° |
| 2036-04-29 Tue | 1 | — | unknown | — | 89.8° 11:30 | 6.45 | 15% | 66.7° |
| 2036-04-30 Wed | 1 | — | unknown | — | 89.7° 11:25 | 6.39 | 25% | 77.5° |
| 2036-05-01 Thu | 1 | — | unknown | — | 89.5° 11:20 | 6.33 | 35% | 88.7° |
| 2036-05-02 Fri | 1 | — | unknown | — | 89.6° 11:20 | 6.27 | 46% | 99.9° |
| 2036-05-03 Sat | 1 | — | unknown | — | 89.8° 11:15 | 6.21 | 58% | 110.8° |
| 2036-05-04 Sun | 1 | — | unknown | — | 89.7° 11:10 | 6.16 | 69% | 121.0° |
| 2036-05-05 Mon | 2 | — | unknown | — | 89.6° 11:05 | 6.1 | 78% | 130.1° |
| 2036-05-06 Tue | 2 | — | unknown | 05:00–05:05 (marginal, 0.08 h) | 89.5° 11:05 | 6.04 | 87% | 137.2° |
| 2036-05-07 Wed | 2 | — | unknown | — | 89.7° 11:00 | 5.99 | 93% | 141.4° |
| 2036-05-08 Thu | 2 | — | unknown | — | 89.8° 10:55 | 5.93 | 98% | 141.8° |
| 2036-05-09 Fri | 2 | — | unknown | — | 89.7° 10:50 | 5.87 | 100% | 138.4° |
| 2036-05-10 Sat | 3 | — | unknown | 04:10–04:15 (marginal, 0.08 h) | 89.6° 10:45 | 5.82 | 99% | 132.3° |
| 2036-05-11 Sun | 3 | — | unknown | 04:05–04:15 (marginal, 0.17 h) | 89.6° 10:45 | 5.76 | 97% | 124.5° |
| 2036-05-12 Mon | 3 | — | unknown | 04:00–04:10 (marginal, 0.17 h) | 89.7° 10:40 | 5.71 | 93% | 115.7° |
| 2036-05-13 Tue | 3 | — | unknown | 04:00–04:10 (marginal, 0.17 h) | 89.8° 10:35 | 5.65 | 87% | 106.6° |
| 2036-05-14 Wed | 3 | — | unknown | 03:55–04:10 (marginal, 0.25 h) | 89.7° 10:30 | 5.6 | 80% | 97.2° |
| 2036-05-15 Thu | 3 | — | unknown | 03:50–04:05 (marginal, 0.25 h) | 89.5° 10:25 | 5.55 | 72% | 87.8° |
| 2036-05-16 Fri | 4 | — | unknown | 03:45–04:05 (marginal, 0.33 h) | 89.6° 10:25 | 5.49 | 63% | 78.5° |
| 2036-05-17 Sat | 4 | — | unknown | 03:45–04:05 (marginal, 0.33 h) | 89.8° 10:20 | 5.44 | 54% | 69.4° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2036-04-18&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.