← 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 | 8 | 100 | 8 | 20:00–20:05 (good, 0.08 h) | 79.1° 14:30 | 9.08 | 27% | 102.5° |
| 2026-03-14 Sat | 7 | 100 | 7 | 19:30–20:30 (marginal, 1.0 h) | 79.1° 14:30 | 9.03 | 18% | 90.5° |
| 2026-03-15 Sun | 5 | 100 | 5 | 20:05–20:25 (marginal, 0.33 h) | 79.1° 14:25 | 8.98 | 11% | 78.2° |
| 2026-03-16 Mon | 4 | 0 | 0 | — | 79.1° 14:20 | 8.93 | 5% | 65.6° |
| 2026-03-17 Tue | 4 | 0 | 0 | — | 79.1° 14:15 | 8.88 | 2% | 52.7° |
| 2026-03-18 Wed | 3 | 0 | 0 | — | 79.1° 14:10 | 8.82 | 0% | 39.9° |
| 2026-03-19 Thu | 2 | 0 | 0 | — | 79.1° 14:10 | 8.77 | 1% | 27.5° |
| 2026-03-20 Fri | 1 | 0 | 0 | — | 79.1° 14:05 | 8.72 | 5% | 17.5° |
| 2026-03-21 Sat | 1 | 0 | 0 | — | 79.1° 14:00 | 8.67 | 11% | 16.0° |
| 2026-03-22 Sun | 1 | 0 | 0 | — | 79.1° 13:55 | 8.62 | 19% | 24.8° |
| 2026-03-23 Mon | 0 | 0 | 0 | — | 79.1° 13:50 | 8.57 | 29% | 37.1° |
| 2026-03-24 Tue | 0 | 0 | 0 | — | 79.1° 13:50 | 8.51 | 40% | 50.3° |
| 2026-03-25 Wed | 0 | 98 | 0 | — | 79.1° 13:45 | 8.46 | 52% | 63.7° |
| 2026-03-26 Thu | 0 | 51 | 0 | — | 79.1° 13:40 | 8.41 | 63% | 77.1° |
| 2026-03-27 Fri | 0 | 0 | 0 | — | 79.1° 13:35 | 8.35 | 73% | 90.4° |
| 2026-03-28 Sat | 0 | 73 | 0 | — | 79.1° 13:35 | 8.3 | 82% | 103.5° |
| 2026-03-29 Sun | 0 | 0 | 0 | — | 79.1° 14:30 | 8.25 | 90% | 116.3° |
| 2026-03-30 Mon | 0 | 0 | 0 | — | 79.1° 14:25 | 8.19 | 95% | 128.9° |
| 2026-03-31 Tue | 0 | 30 | 0 | — | 79.1° 14:20 | 8.14 | 99% | 140.9° |
| 2026-04-01 Wed | 0 | 0 | 0 | — | 79.1° 14:15 | 8.08 | 100% | 152.1° |
| 2026-04-02 Thu | 0 | 0 | 0 | — | 79.1° 14:15 | 8.03 | 99% | 161.3° |
| 2026-04-03 Fri | 0 | 0 | 0 | — | 79.1° 14:10 | 7.97 | 96% | 164.8° |
| 2026-04-04 Sat | 0 | 0 | 0 | — | 79.1° 14:05 | 7.92 | 92% | 159.9° |
| 2026-04-05 Sun | 0 | 0 | 0 | — | 79.1° 14:00 | 7.86 | 86% | 150.8° |
| 2026-04-06 Mon | 0 | 0 | 0 | — | 79.1° 13:55 | 7.8 | 79% | 140.3° |
| 2026-04-07 Tue | 0 | 0 | 0 | — | 79.1° 13:55 | 7.75 | 71% | 129.3° |
| 2026-04-08 Wed | 0 | 0 | 0 | — | 79.1° 13:50 | 7.69 | 62% | 118.0° |
| 2026-04-09 Thu | 0 | 0 | 0 | — | 79.1° 13:45 | 7.64 | 53% | 106.6° |
| 2026-04-10 Fri | 0 | 0 | 0 | — | 79.1° 13:40 | 7.58 | 43% | 94.9° |
| 2026-04-11 Sat | 0 | 0 | 0 | — | 79.1° 13:40 | 7.52 | 33% | 82.9° |
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.