← 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. |
|---|---|---|---|---|---|---|---|---|
| 2042-03-18 Tue | 36 | — | unknown | 20:05–21:30 (good, 1.42 h) | 42.9° 18:15 | 8.82 | 11% | 116.5° |
| 2042-03-19 Wed | 33 | — | unknown | 20:10–21:30 (good, 1.33 h) | 42.9° 18:10 | 8.77 | 5% | 104.4° |
| 2042-03-20 Thu | 32 | — | unknown | 20:10–21:25 (good, 1.25 h) | 42.9° 18:05 | 8.72 | 1% | 91.8° |
| 2042-03-21 Fri | 30 | — | unknown | 20:10–21:20 (good, 1.17 h) | 42.9° 18:00 | 8.66 | 0% | 79.0° |
| 2042-03-22 Sat | 28 | — | unknown | 20:10–21:15 (good, 1.08 h) | 42.9° 17:55 | 8.61 | 2% | 66.5° |
| 2042-03-23 Sun | 26 | — | unknown | 20:15–21:10 (good, 0.92 h) | 42.9° 17:55 | 8.56 | 7% | 54.8° |
| 2042-03-24 Mon | 22 | — | unknown | 20:15–21:00 (good, 0.75 h) | 42.9° 17:50 | 8.51 | 15% | 44.6° |
| 2042-03-25 Tue | 18 | — | unknown | 20:15–20:50 (good, 0.58 h) | 42.9° 17:45 | 8.45 | 24% | 36.9° |
| 2042-03-26 Wed | 13 | — | unknown | 20:15–20:30 (good, 0.25 h) | 42.9° 17:40 | 8.4 | 34% | 33.2° |
| 2042-03-27 Thu | 10 | — | unknown | 20:20–21:25 (marginal, 1.08 h) | 42.9° 17:40 | 8.35 | 44% | 34.2° |
| 2042-03-28 Fri | 7 | — | unknown | 20:20–21:10 (marginal, 0.83 h) | 42.9° 17:35 | 8.29 | 55% | 39.1° |
| 2042-03-29 Sat | 6 | — | unknown | 20:20–21:00 (marginal, 0.67 h) | 42.9° 17:30 | 8.24 | 64% | 46.6° |
| 2042-03-30 Sun | 5 | — | unknown | 21:20–21:55 (marginal, 0.58 h) | 42.9° 18:25 | 8.18 | 74% | 55.3° |
| 2042-03-31 Mon | 4 | — | unknown | 21:25–21:50 (marginal, 0.42 h) | 42.9° 18:20 | 8.13 | 82% | 64.7° |
| 2042-04-01 Tue | 4 | — | unknown | 21:25–21:55 (marginal, 0.5 h) | 42.9° 18:20 | 8.08 | 88% | 74.4° |
| 2042-04-02 Wed | 4 | — | unknown | 21:25–21:55 (marginal, 0.5 h) | 42.9° 18:15 | 8.02 | 94% | 84.3° |
| 2042-04-03 Thu | 5 | — | unknown | 21:25–22:00 (marginal, 0.58 h) | 42.9° 18:10 | 7.97 | 98% | 94.2° |
| 2042-04-04 Fri | 4 | — | unknown | 21:30–21:55 (marginal, 0.42 h) | 42.9° 18:05 | 7.91 | 100% | 104.1° |
| 2042-04-05 Sat | 4 | — | unknown | 21:30–21:50 (marginal, 0.33 h) | 42.9° 18:00 | 7.85 | 100% | 113.8° |
| 2042-04-06 Sun | 4 | — | unknown | 21:30–21:50 (marginal, 0.33 h) | 42.9° 18:00 | 7.8 | 98% | 123.1° |
| 2042-04-07 Mon | 3 | — | unknown | 21:00–21:15 (marginal, 0.25 h) | 42.9° 17:55 | 7.74 | 95% | 131.8° |
| 2042-04-08 Tue | 3 | — | unknown | 21:00–21:10 (marginal, 0.17 h) | 42.9° 17:50 | 7.69 | 90% | 139.3° |
| 2042-04-09 Wed | 2 | — | unknown | 21:00–21:05 (marginal, 0.08 h) | 42.9° 17:45 | 7.63 | 83% | 144.8° |
| 2042-04-10 Thu | 2 | — | unknown | — | 42.9° 17:45 | 7.57 | 75% | 147.0° |
| 2042-04-11 Fri | 1 | — | unknown | — | 42.9° 17:40 | 7.52 | 66% | 145.0° |
| 2042-04-12 Sat | 1 | — | unknown | — | 42.9° 17:35 | 7.46 | 56% | 139.2° |
| 2042-04-13 Sun | 1 | — | unknown | — | 42.9° 17:30 | 7.4 | 45% | 130.8° |
| 2042-04-14 Mon | 1 | — | unknown | — | 42.9° 17:25 | 7.34 | 34% | 120.7° |
| 2042-04-15 Tue | 0 | — | unknown | — | 42.9° 17:25 | 7.29 | 24% | 109.3° |
| 2042-04-16 Wed | 0 | — | unknown | — | 42.9° 17:20 | 7.23 | 14% | 97.3° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2042-03-18&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.