← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-07-20 Mon | 100 | 53 | 53 | 02:00–04:05 (good, 2.08 h) | 89.7° 06:10 | 5.22 | 45% | 150.3° |
| 2026-07-21 Tue | 100 | 72 | 72 | 00:15–03:00 (good, 2.75 h) | 89.7° 06:05 | 5.27 | 55% | 150.7° |
| 2026-07-22 Wed | 100 | 98 | 98 | 00:05–04:10 (good, 4.08 h) | 89.6° 06:00 | 5.32 | 64% | 146.7° |
| 2026-07-23 Thu | 100 | 64 | 64 | 00:10–02:00 (good, 1.83 h) | 89.5° 06:00 | 5.37 | 73% | 139.9° |
| 2026-07-24 Fri | 100 | 0 | 0 | — | 89.7° 05:55 | 5.42 | 81% | 131.3° |
| 2026-07-25 Sat | 100 | 86 | 86 | 01:00–04:15 (good, 3.25 h) | 89.7° 05:50 | 5.47 | 88% | 121.9° |
| 2026-07-26 Sun | 100 | 88 | 88 | 00:00–04:15 (good, 4.25 h) | 89.7° 05:45 | 5.52 | 93% | 112.0° |
| 2026-07-27 Mon | 85 | 99 | 84 | 00:05–04:20 (good, 4.25 h) | 89.5° 05:40 | 5.58 | 97% | 101.7° |
| 2026-07-28 Tue | 75 | 90 | 67 | 01:15–04:20 (good, 3.08 h) | 89.6° 05:40 | 5.63 | 100% | 91.1° |
| 2026-07-29 Wed | 62 | 100 | 62 | 01:20–04:20 (good, 3.0 h) | 89.7° 05:35 | 5.68 | 100% | 80.4° |
| 2026-07-30 Thu | 50 | 100 | 50 | 02:45–04:20 (good, 1.58 h) | 89.7° 05:30 | 5.74 | 98% | 69.7° |
| 2026-07-31 Fri | 42 | 100 | 42 | 23:00–04:25 (marginal, 5.42 h) | 89.6° 05:25 | 5.79 | 95% | 59.1° |
| 2026-08-01 Sat | 37 | 100 | 37 | 22:55–04:25 (marginal, 5.5 h) | 89.5° 05:20 | 5.85 | 89% | 48.9° |
| 2026-08-02 Sun | 37 | 99 | 37 | 22:50–04:25 (marginal, 5.58 h) | 89.6° 05:20 | 5.9 | 82% | 39.6° |
| 2026-08-03 Mon | 42 | 99 | 42 | 22:40–04:30 (marginal, 5.83 h) | 89.7° 05:15 | 5.96 | 73% | 32.3° |
| 2026-08-04 Tue | 58 | 96 | 56 | 22:35–04:30 (marginal, 5.92 h) | 89.7° 05:10 | 6.01 | 63% | 28.9° |
| 2026-08-05 Wed | 81 | 93 | 75 | 00:05–04:30 (good, 4.42 h) | 89.6° 05:05 | 6.07 | 52% | 31.0° |
| 2026-08-06 Thu | 85 | 90 | 77 | 23:10–04:35 (good, 5.42 h) | 89.5° 05:05 | 6.13 | 40% | 38.0° |
| 2026-08-07 Fri | 91 | 98 | 89 | 23:00–04:35 (good, 5.58 h) | 89.6° 05:00 | 6.18 | 30% | 48.0° |
| 2026-08-08 Sat | 98 | 75 | 74 | 23:00–03:00 (good, 4.0 h) | 89.7° 04:55 | 6.24 | 19% | 59.6° |
| 2026-08-09 Sun | 100 | 95 | 95 | 23:00–04:40 (good, 5.67 h) | 89.7° 04:50 | 6.3 | 11% | 72.0° |
| 2026-08-10 Mon | 100 | 99 | 99 | 22:45–04:40 (good, 5.92 h) | 89.5° 04:45 | 6.35 | 5% | 84.9° |
| 2026-08-11 Tue | 100 | 100 | 100 | 22:40–04:40 (good, 6.0 h) | 89.6° 04:45 | 6.41 | 1% | 97.7° |
| 2026-08-12 Wed | 100 | 97 | 97 | 22:40–04:45 (good, 6.08 h) | 89.7° 04:40 | 6.47 | 0% | 110.3° |
| 2026-08-13 Thu | 100 | 25 | 25 | 23:00–00:00 (good, 1.0 h) | 89.7° 04:35 | 6.53 | 2% | 122.4° |
| 2026-08-14 Fri | 100 | 66 | 66 | 22:35–02:00 (good, 3.42 h) | 89.6° 04:30 | 6.58 | 6% | 133.4° |
| 2026-08-15 Sat | 100 | 100 | 100 | 22:25–04:45 (good, 6.33 h) | 89.5° 04:25 | 6.64 | 12% | 142.6° |
| 2026-08-16 Sun | 100 | 100 | 100 | 22:20–04:50 (good, 6.5 h) | 89.6° 04:25 | 6.7 | 20% | 149.1° |
| 2026-08-17 Mon | 100 | 100 | 100 | 22:15–04:50 (good, 6.58 h) | 89.7° 04:20 | 6.76 | 29% | 151.2° |
| 2026-08-18 Tue | 100 | 60 | 60 | 23:25–02:00 (good, 2.58 h) | 89.7° 04:15 | 6.81 | 39% | 148.5° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-07-20&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.