← 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 | 5 | 100 | 5 | 20:00–20:20 (marginal, 0.33 h) | 89.7° 13:40 | 9.08 | 27% | 97.5° |
| 2026-03-14 Sat | 5 | 100 | 5 | 20:00–20:20 (marginal, 0.33 h) | 89.6° 13:35 | 9.03 | 18% | 86.7° |
| 2026-03-15 Sun | 3 | 100 | 3 | 20:05–20:15 (marginal, 0.17 h) | 89.5° 13:35 | 8.98 | 11% | 75.7° |
| 2026-03-16 Mon | 3 | 0 | 0 | — | 89.7° 13:30 | 8.93 | 5% | 64.5° |
| 2026-03-17 Tue | 2 | 0 | 0 | — | 89.7° 13:25 | 8.88 | 2% | 53.4° |
| 2026-03-18 Wed | 1 | 0 | 0 | — | 89.7° 13:20 | 8.82 | 0% | 43.1° |
| 2026-03-19 Thu | 1 | 0 | 0 | — | 89.5° 13:15 | 8.77 | 1% | 34.5° |
| 2026-03-20 Fri | 1 | 0 | 0 | — | 89.6° 13:15 | 8.72 | 5% | 29.7° |
| 2026-03-21 Sat | 1 | 0 | 0 | — | 89.7° 13:10 | 8.67 | 11% | 30.8° |
| 2026-03-22 Sun | 0 | 0 | 0 | — | 89.7° 13:05 | 8.62 | 19% | 37.3° |
| 2026-03-23 Mon | 0 | 0 | 0 | — | 89.6° 13:00 | 8.57 | 29% | 47.0° |
| 2026-03-24 Tue | 0 | 0 | 0 | — | 89.5° 12:55 | 8.51 | 40% | 58.2° |
| 2026-03-25 Wed | 0 | 98 | 0 | — | 89.6° 12:55 | 8.46 | 52% | 70.1° |
| 2026-03-26 Thu | 0 | 51 | 0 | — | 89.7° 12:50 | 8.41 | 63% | 82.1° |
| 2026-03-27 Fri | 0 | 0 | 0 | — | 89.7° 12:45 | 8.35 | 73% | 94.1° |
| 2026-03-28 Sat | 0 | 73 | 0 | — | 89.6° 12:40 | 8.3 | 82% | 105.9° |
| 2026-03-29 Sun | 0 | 0 | 0 | — | 89.5° 13:40 | 8.25 | 90% | 117.2° |
| 2026-03-30 Mon | 0 | 0 | 0 | — | 89.7° 13:35 | 8.19 | 95% | 127.9° |
| 2026-03-31 Tue | 0 | 0 | 0 | — | 89.7° 13:30 | 8.14 | 99% | 137.5° |
| 2026-04-01 Wed | 0 | 0 | 0 | — | 89.7° 13:25 | 8.08 | 100% | 145.3° |
| 2026-04-02 Thu | 0 | 0 | 0 | — | 89.5° 13:20 | 8.03 | 99% | 149.9° |
| 2026-04-03 Fri | 0 | 0 | 0 | — | 89.6° 13:20 | 7.97 | 96% | 150.2° |
| 2026-04-04 Sat | 0 | 0 | 0 | — | 89.7° 13:15 | 7.92 | 92% | 146.2° |
| 2026-04-05 Sun | 0 | 0 | 0 | — | 89.7° 13:10 | 7.86 | 86% | 139.3° |
| 2026-04-06 Mon | 0 | 58 | 0 | — | 89.6° 13:05 | 7.8 | 79% | 130.8° |
| 2026-04-07 Tue | 0 | 100 | 0 | — | 89.5° 13:00 | 7.75 | 71% | 121.4° |
| 2026-04-08 Wed | 0 | 46 | 0 | — | 89.6° 13:00 | 7.69 | 62% | 111.5° |
| 2026-04-09 Thu | 0 | 0 | 0 | — | 89.7° 12:55 | 7.64 | 53% | 101.2° |
| 2026-04-10 Fri | 0 | 0 | 0 | — | 89.7° 12:50 | 7.58 | 43% | 90.7° |
| 2026-04-11 Sat | 0 | 0 | 0 | — | 89.6° 12:45 | 7.52 | 33% | 79.9° |
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.