← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-03-07 Sat | 54 | 79 | 43 | 19:55–20:30 (good, 0.58 h) | 42.9° 18:55 | 9.37 | 81% | 126.5° |
| 2026-03-08 Sun | 52 | 59 | 30 | 21:00–21:45 (good, 0.75 h) | 42.9° 18:50 | 9.32 | 72% | 134.7° |
| 2026-03-09 Mon | 51 | 49 | 25 | 21:00–22:40 (marginal, 1.67 h) | 42.9° 18:50 | 9.27 | 64% | 141.2° |
| 2026-03-10 Tue | 49 | 99 | 49 | 19:55–22:00 (good, 2.08 h) | 42.9° 18:45 | 9.22 | 54% | 145.3° |
| 2026-03-11 Wed | 47 | 23 | 11 | 20:00–21:00 (marginal, 1.0 h) | 42.9° 18:40 | 9.17 | 45% | 146.1° |
| 2026-03-12 Thu | 45 | 0 | 0 | — | 42.9° 18:35 | 9.13 | 36% | 143.3° |
| 2026-03-13 Fri | 43 | 100 | 43 | 20:00–21:50 (good, 1.83 h) | 42.9° 18:30 | 9.08 | 27% | 137.5° |
| 2026-03-14 Sat | 42 | 100 | 42 | 20:00–21:50 (good, 1.83 h) | 42.9° 18:30 | 9.03 | 18% | 129.6° |
| 2026-03-15 Sun | 40 | 97 | 39 | 20:05–21:40 (good, 1.58 h) | 42.9° 18:25 | 8.98 | 11% | 120.3° |
| 2026-03-16 Mon | 38 | 2 | 1 | — | 42.9° 18:20 | 8.93 | 5% | 110.0° |
| 2026-03-17 Tue | 37 | 0 | 0 | — | 42.9° 18:15 | 8.88 | 2% | 98.9° |
| 2026-03-18 Wed | 36 | 0 | 0 | — | 42.9° 18:15 | 8.82 | 0% | 87.5° |
| 2026-03-19 Thu | 33 | 0 | 0 | — | 42.9° 18:10 | 8.77 | 1% | 75.8° |
| 2026-03-20 Fri | 31 | 0 | 0 | — | 42.9° 18:05 | 8.72 | 5% | 64.3° |
| 2026-03-21 Sat | 28 | 0 | 0 | — | 42.9° 18:00 | 8.67 | 11% | 53.4° |
| 2026-03-22 Sun | 23 | 0 | 0 | — | 42.9° 17:55 | 8.62 | 19% | 43.7° |
| 2026-03-23 Mon | 18 | 0 | 0 | — | 42.9° 17:55 | 8.57 | 29% | 36.7° |
| 2026-03-24 Tue | 13 | 0 | 0 | — | 42.9° 17:50 | 8.51 | 40% | 33.8° |
| 2026-03-25 Wed | 9 | 77 | 7 | 20:15–21:00 (marginal, 0.75 h) | 42.9° 17:45 | 8.46 | 52% | 35.9° |
| 2026-03-26 Thu | 7 | 90 | 6 | 20:15–21:10 (marginal, 0.92 h) | 42.9° 17:40 | 8.41 | 63% | 42.2° |
| 2026-03-27 Fri | 6 | 0 | 0 | — | 42.9° 17:35 | 8.35 | 73% | 51.0° |
| 2026-03-28 Sat | 6 | 35 | 2 | — | 42.9° 17:35 | 8.3 | 82% | 61.0° |
| 2026-03-29 Sun | 6 | 0 | 0 | — | 42.9° 18:30 | 8.25 | 90% | 71.6° |
| 2026-03-30 Mon | 6 | 3 | 0 | — | 42.9° 18:25 | 8.19 | 95% | 82.5° |
| 2026-03-31 Tue | 7 | 10 | 1 | — | 42.9° 18:20 | 8.14 | 99% | 93.3° |
| 2026-04-01 Wed | 8 | 0 | 0 | — | 42.9° 18:20 | 8.08 | 100% | 103.8° |
| 2026-04-02 Thu | 8 | 0 | 0 | — | 42.9° 18:15 | 8.03 | 99% | 114.0° |
| 2026-04-03 Fri | 8 | 0 | 0 | — | 42.9° 18:10 | 7.97 | 96% | 123.5° |
| 2026-04-04 Sat | 7 | 0 | 0 | — | 42.9° 18:05 | 7.92 | 92% | 132.1° |
| 2026-04-05 Sun | 6 | 89 | 5 | 21:30–21:50 (marginal, 0.33 h) | 42.9° 18:00 | 7.86 | 86% | 139.3° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-03-07&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.