← 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 | 47 | 100 | 47 | 20:00–21:55 (good, 1.92 h) | 72.5° 16:45 | 9.08 | 27% | 128.5° |
| 2026-03-14 Sat | 46 | 100 | 46 | 20:00–21:50 (good, 1.83 h) | 72.5° 16:40 | 9.03 | 18% | 116.1° |
| 2026-03-15 Sun | 43 | 97 | 42 | 20:05–21:45 (good, 1.67 h) | 72.5° 16:35 | 8.98 | 11% | 103.4° |
| 2026-03-16 Mon | 42 | 2 | 1 | — | 72.5° 16:30 | 8.93 | 5% | 90.2° |
| 2026-03-17 Tue | 40 | 0 | 0 | — | 72.5° 16:30 | 8.88 | 2% | 76.8° |
| 2026-03-18 Wed | 38 | 0 | 0 | — | 72.5° 16:25 | 8.82 | 0% | 63.0° |
| 2026-03-19 Thu | 36 | 0 | 0 | — | 72.5° 16:20 | 8.77 | 1% | 48.9° |
| 2026-03-20 Fri | 33 | 0 | 0 | — | 72.5° 16:15 | 8.72 | 5% | 34.6° |
| 2026-03-21 Sat | 29 | 0 | 0 | — | 72.5° 16:15 | 8.67 | 11% | 20.1° |
| 2026-03-22 Sun | 24 | 0 | 0 | — | 72.5° 16:10 | 8.62 | 19% | 5.8° |
| 2026-03-23 Mon | 19 | 0 | 0 | — | 72.5° 16:05 | 8.57 | 29% | 8.8° |
| 2026-03-24 Tue | 14 | 0 | 0 | — | 72.5° 16:00 | 8.51 | 40% | 23.0° |
| 2026-03-25 Wed | 10 | 77 | 8 | 20:15–21:00 (marginal, 0.75 h) | 72.5° 15:55 | 8.46 | 52% | 37.1° |
| 2026-03-26 Thu | 8 | 90 | 7 | 20:15–21:20 (marginal, 1.08 h) | 72.5° 15:55 | 8.41 | 63% | 51.1° |
| 2026-03-27 Fri | 8 | 0 | 0 | — | 72.5° 15:50 | 8.35 | 73% | 64.8° |
| 2026-03-28 Sat | 8 | 35 | 3 | — | 72.5° 15:45 | 8.3 | 82% | 78.4° |
| 2026-03-29 Sun | 9 | 0 | 0 | — | 72.5° 16:40 | 8.25 | 90% | 91.8° |
| 2026-03-30 Mon | 10 | 3 | 0 | — | 72.5° 16:35 | 8.19 | 95% | 104.9° |
| 2026-03-31 Tue | 10 | 9 | 1 | — | 72.5° 16:35 | 8.14 | 99% | 117.9° |
| 2026-04-01 Wed | 9 | 0 | 0 | — | 72.5° 16:30 | 8.08 | 100% | 130.7° |
| 2026-04-02 Thu | 9 | 0 | 0 | — | 72.5° 16:25 | 8.03 | 99% | 143.2° |
| 2026-04-03 Fri | 9 | 0 | 0 | — | 72.5° 16:20 | 7.97 | 96% | 155.5° |
| 2026-04-04 Sat | 7 | 0 | 0 | — | 72.5° 16:20 | 7.92 | 92% | 167.7° |
| 2026-04-05 Sun | 6 | 89 | 5 | 21:30–21:50 (marginal, 0.33 h) | 72.5° 16:15 | 7.86 | 86% | 179.0° |
| 2026-04-06 Mon | 5 | 80 | 4 | 21:30–21:45 (marginal, 0.25 h) | 72.5° 16:10 | 7.8 | 79% | 168.4° |
| 2026-04-07 Tue | 4 | 20 | 1 | — | 72.5° 16:05 | 7.75 | 71% | 156.6° |
| 2026-04-08 Wed | 3 | 100 | 3 | 21:00–21:15 (marginal, 0.25 h) | 72.5° 16:00 | 7.69 | 62% | 144.7° |
| 2026-04-09 Thu | 2 | 15 | 0 | — | 72.5° 16:00 | 7.64 | 53% | 132.8° |
| 2026-04-10 Fri | 2 | 0 | 0 | — | 72.5° 15:55 | 7.58 | 43% | 120.7° |
| 2026-04-11 Sat | 1 | 49 | 0 | — | 72.5° 15:50 | 7.52 | 33% | 108.3° |
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.