← 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 | 54 | 54 | 02:00–04:05 (good, 2.08 h) | 87.3° 02:25 | 5.22 | 45% | 117.1° |
| 2026-07-21 Tue | 100 | 73 | 73 | 23:00–03:00 (good, 4.0 h) | 87.3° 02:20 | 5.27 | 55% | 112.1° |
| 2026-07-22 Wed | 100 | 96 | 96 | 22:50–04:10 (good, 5.33 h) | 87.3° 02:20 | 5.32 | 64% | 106.4° |
| 2026-07-23 Thu | 100 | 61 | 61 | 23:00–02:00 (good, 3.0 h) | 87.3° 02:15 | 5.37 | 73% | 100.2° |
| 2026-07-24 Fri | 100 | 0 | 0 | — | 87.3° 02:10 | 5.42 | 81% | 93.7° |
| 2026-07-25 Sat | 100 | 87 | 87 | 01:00–04:15 (good, 3.25 h) | 87.3° 02:05 | 5.47 | 88% | 87.1° |
| 2026-07-26 Sun | 100 | 86 | 86 | 00:00–04:15 (good, 4.25 h) | 87.3° 02:00 | 5.52 | 93% | 80.6° |
| 2026-07-27 Mon | 76 | 99 | 75 | 22:45–04:20 (good, 5.58 h) | 87.3° 02:00 | 5.58 | 97% | 74.4° |
| 2026-07-28 Tue | 69 | 90 | 62 | 23:00–01:00 (good, 2.0 h) | 87.3° 01:55 | 5.63 | 100% | 68.6° |
| 2026-07-29 Wed | 63 | 100 | 63 | 22:40–00:25 (good, 1.75 h) | 87.3° 01:50 | 5.68 | 100% | 63.5° |
| 2026-07-30 Thu | 61 | 100 | 61 | 22:40–23:55 (good, 1.25 h) | 87.3° 01:45 | 5.74 | 98% | 59.6° |
| 2026-07-31 Fri | 63 | 100 | 63 | 22:35–00:05 (good, 1.5 h) | 87.3° 01:45 | 5.79 | 95% | 57.0° |
| 2026-08-01 Sat | 69 | 100 | 69 | 22:35–00:50 (good, 2.25 h) | 87.3° 01:40 | 5.85 | 89% | 56.2° |
| 2026-08-02 Sun | 73 | 99 | 72 | 22:35–02:05 (good, 3.5 h) | 87.3° 01:35 | 5.9 | 82% | 57.3° |
| 2026-08-03 Mon | 100 | 99 | 99 | 22:30–04:30 (good, 6.0 h) | 87.3° 01:30 | 5.96 | 73% | 60.3° |
| 2026-08-04 Tue | 100 | 95 | 95 | 22:30–04:30 (good, 6.0 h) | 87.3° 01:25 | 6.01 | 63% | 65.0° |
| 2026-08-05 Wed | 100 | 90 | 90 | 22:30–04:30 (good, 6.0 h) | 87.3° 01:25 | 6.07 | 52% | 71.0° |
| 2026-08-06 Thu | 100 | 90 | 90 | 22:25–04:35 (good, 6.17 h) | 87.3° 01:20 | 6.13 | 40% | 78.1° |
| 2026-08-07 Fri | 100 | 97 | 97 | 22:25–04:35 (good, 6.17 h) | 87.3° 01:15 | 6.18 | 30% | 85.8° |
| 2026-08-08 Sat | 100 | 77 | 77 | 22:20–03:00 (good, 4.67 h) | 87.3° 01:10 | 6.24 | 19% | 93.9° |
| 2026-08-09 Sun | 100 | 94 | 94 | 22:20–04:40 (good, 6.33 h) | 87.3° 01:05 | 6.3 | 11% | 101.8° |
| 2026-08-10 Mon | 100 | 99 | 99 | 22:20–04:40 (good, 6.33 h) | 87.3° 01:05 | 6.35 | 5% | 109.3° |
| 2026-08-11 Tue | 100 | 100 | 100 | 22:15–04:40 (good, 6.42 h) | 87.3° 01:00 | 6.41 | 1% | 115.6° |
| 2026-08-12 Wed | 100 | 97 | 97 | 22:15–04:45 (good, 6.5 h) | 87.3° 00:55 | 6.47 | 0% | 120.4° |
| 2026-08-13 Thu | 100 | 31 | 31 | 22:15–01:00 (good, 2.75 h) | 87.3° 00:50 | 6.53 | 2% | 123.2° |
| 2026-08-14 Fri | 100 | 68 | 68 | 22:10–02:00 (good, 3.83 h) | 87.3° 00:50 | 6.58 | 6% | 123.7° |
| 2026-08-15 Sat | 100 | 99 | 99 | 22:10–04:45 (good, 6.58 h) | 87.3° 00:45 | 6.64 | 12% | 122.1° |
| 2026-08-16 Sun | 100 | 100 | 100 | 22:05–04:50 (good, 6.75 h) | 87.3° 00:40 | 6.7 | 20% | 118.7° |
| 2026-08-17 Mon | 100 | 100 | 100 | 22:05–04:50 (good, 6.75 h) | 87.3° 00:35 | 6.76 | 29% | 114.0° |
| 2026-08-18 Tue | 100 | 62 | 62 | 22:05–02:00 (good, 3.92 h) | 87.3° 00:30 | 6.81 | 39% | 108.4° |
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.