← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-03-13 Fri | 86 | 100 | 86 | 01:35–05:05 (good, 3.5 h) | 87.1° 07:30 | 9.08 | 27% | 65.8° |
| 2026-03-14 Sat | 92 | 80 | 74 | 02:00–05:05 (good, 3.08 h) | 87.1° 07:30 | 9.03 | 18% | 66.3° |
| 2026-03-15 Sun | 92 | 97 | 89 | 01:50–05:00 (good, 3.17 h) | 87.1° 07:25 | 8.98 | 11% | 68.0° |
| 2026-03-16 Mon | 93 | 53 | 49 | 03:00–05:00 (good, 2.0 h) | 87.1° 07:20 | 8.93 | 5% | 71.0° |
| 2026-03-17 Tue | 95 | 0 | 0 | — | 87.1° 07:15 | 8.88 | 2% | 75.0° |
| 2026-03-18 Wed | 96 | 0 | 0 | — | 87.1° 07:10 | 8.82 | 0% | 79.9° |
| 2026-03-19 Thu | 97 | 0 | 0 | — | 87.1° 07:10 | 8.77 | 1% | 85.4° |
| 2026-03-20 Fri | 97 | 0 | 0 | — | 87.1° 07:05 | 8.72 | 5% | 91.3° |
| 2026-03-21 Sat | 98 | 0 | 0 | — | 87.1° 07:00 | 8.67 | 11% | 97.1° |
| 2026-03-22 Sun | 99 | 0 | 0 | — | 87.1° 06:55 | 8.62 | 19% | 102.6° |
| 2026-03-23 Mon | 100 | 0 | 0 | — | 87.1° 06:50 | 8.57 | 29% | 107.3° |
| 2026-03-24 Tue | 100 | 0 | 0 | — | 87.1° 06:50 | 8.51 | 40% | 111.0° |
| 2026-03-25 Wed | 99 | 83 | 82 | 01:00–04:00 (good, 3.0 h) | 87.1° 06:45 | 8.46 | 52% | 113.3° |
| 2026-03-26 Thu | 97 | 3 | 3 | — | 87.1° 06:40 | 8.41 | 63% | 114.2° |
| 2026-03-27 Fri | 97 | 16 | 15 | 02:00–03:00 (marginal, 1.0 h) | 87.1° 06:35 | 8.35 | 73% | 113.6° |
| 2026-03-28 Sat | 93 | 0 | 0 | — | 87.1° 07:30 | 8.3 | 82% | 111.7° |
| 2026-03-29 Sun | 79 | 0 | 0 | — | 87.1° 07:30 | 8.25 | 90% | 108.5° |
| 2026-03-30 Mon | 74 | 0 | 0 | — | 87.1° 07:25 | 8.19 | 95% | 104.5° |
| 2026-03-31 Tue | 68 | 0 | 0 | — | 87.1° 07:20 | 8.14 | 99% | 99.8° |
| 2026-04-01 Wed | 64 | 0 | 0 | — | 87.1° 07:15 | 8.08 | 100% | 94.8° |
| 2026-04-02 Thu | 60 | 0 | 0 | — | 87.1° 07:15 | 8.03 | 99% | 89.6° |
| 2026-04-03 Fri | 57 | 0 | 0 | — | 87.1° 07:10 | 7.97 | 96% | 84.6° |
| 2026-04-04 Sat | 57 | 20 | 12 | — | 87.1° 07:05 | 7.92 | 92% | 79.8° |
| 2026-04-05 Sun | 58 | 83 | 48 | 04:00–05:20 (good, 1.33 h) | 87.1° 07:00 | 7.86 | 86% | 75.5° |
| 2026-04-06 Mon | 63 | 94 | 59 | 01:30–05:00 (good, 3.5 h) | 87.1° 06:55 | 7.8 | 79% | 71.8° |
| 2026-04-07 Tue | 77 | 59 | 45 | 04:00–05:20 (good, 1.33 h) | 87.1° 06:55 | 7.75 | 71% | 68.9° |
| 2026-04-08 Wed | 87 | 2 | 1 | — | 87.1° 06:50 | 7.69 | 62% | 66.8° |
| 2026-04-09 Thu | 94 | 33 | 31 | 00:20–03:00 (marginal, 2.67 h) | 87.1° 06:45 | 7.64 | 53% | 65.8° |
| 2026-04-10 Fri | 98 | 0 | 0 | — | 87.1° 06:40 | 7.58 | 43% | 65.9° |
| 2026-04-11 Sat | 100 | 24 | 24 | 01:30–02:00 (good, 0.5 h) | 87.1° 06:35 | 7.52 | 33% | 67.1° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-03-13&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.