← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-07-31 Fri | 30 | 100 | 30 | 00:35–04:25 (marginal, 3.83 h) | 79.1° 06:15 | 5.79 | 95% | 59.7° |
| 2026-08-01 Sat | 24 | 100 | 24 | 00:35–04:25 (marginal, 3.83 h) | 79.1° 06:15 | 5.85 | 89% | 47.6° |
| 2026-08-02 Sun | 22 | 100 | 22 | 00:35–04:25 (marginal, 3.83 h) | 79.1° 06:10 | 5.9 | 82% | 35.6° |
| 2026-08-03 Mon | 26 | 100 | 26 | 00:20–04:30 (marginal, 4.17 h) | 79.1° 06:05 | 5.96 | 73% | 24.3° |
| 2026-08-04 Tue | 35 | 98 | 34 | 00:15–04:30 (marginal, 4.25 h) | 79.1° 06:00 | 6.01 | 63% | 15.9° |
| 2026-08-05 Wed | 48 | 95 | 46 | 02:45–04:30 (good, 1.75 h) | 79.1° 06:00 | 6.07 | 52% | 16.4° |
| 2026-08-06 Thu | 64 | 91 | 58 | 02:00–04:35 (good, 2.58 h) | 79.1° 05:55 | 6.13 | 40% | 25.8° |
| 2026-08-07 Fri | 83 | 99 | 82 | 00:25–04:35 (good, 4.17 h) | 79.1° 05:50 | 6.18 | 30% | 38.3° |
| 2026-08-08 Sat | 92 | 71 | 65 | 02:00–03:00 (good, 1.0 h) | 79.1° 05:45 | 6.24 | 19% | 51.8° |
| 2026-08-09 Sun | 98 | 96 | 94 | 00:20–04:40 (good, 4.33 h) | 79.1° 05:40 | 6.3 | 11% | 65.8° |
| 2026-08-10 Mon | 100 | 100 | 100 | 00:10–04:40 (good, 4.5 h) | 79.1° 05:40 | 6.35 | 5% | 80.0° |
| 2026-08-11 Tue | 100 | 100 | 100 | 00:05–04:40 (good, 4.58 h) | 79.1° 05:35 | 6.41 | 1% | 94.2° |
| 2026-08-12 Wed | 100 | 98 | 98 | 00:05–04:45 (good, 4.67 h) | 79.1° 05:30 | 6.47 | 0% | 108.3° |
| 2026-08-13 Thu | 100 | 14 | 14 | 23:30–01:00 (marginal, 1.5 h) | 79.1° 05:25 | 6.53 | 2% | 122.0° |
| 2026-08-14 Fri | 100 | 59 | 59 | 00:05–01:00 (good, 0.92 h) | 79.1° 05:20 | 6.58 | 6% | 135.2° |
| 2026-08-15 Sat | 100 | 100 | 100 | 23:50–04:45 (good, 4.92 h) | 79.1° 05:20 | 6.64 | 12% | 147.5° |
| 2026-08-16 Sun | 100 | 100 | 100 | 23:45–04:50 (good, 5.08 h) | 79.1° 05:15 | 6.7 | 20% | 158.3° |
| 2026-08-17 Mon | 100 | 100 | 100 | 23:45–04:50 (good, 5.08 h) | 79.1° 05:10 | 6.76 | 29% | 165.0° |
| 2026-08-18 Tue | 100 | 56 | 56 | 00:00–02:00 (good, 2.0 h) | 79.1° 05:05 | 6.81 | 39% | 162.9° |
| 2026-08-19 Wed | 100 | 100 | 100 | 23:35–04:55 (good, 5.33 h) | 79.1° 05:05 | 6.87 | 48% | 154.6° |
| 2026-08-20 Thu | 100 | 99 | 99 | 23:35–04:55 (good, 5.33 h) | 79.1° 05:00 | 6.93 | 58% | 144.3° |
| 2026-08-21 Fri | 100 | 100 | 100 | 23:35–04:55 (good, 5.33 h) | 79.1° 04:55 | 6.99 | 67% | 133.4° |
| 2026-08-22 Sat | 100 | 90 | 90 | 01:00–05:00 (good, 4.0 h) | 79.1° 04:50 | 7.04 | 76% | 122.2° |
| 2026-08-23 Sun | 100 | 87 | 87 | 23:45–05:00 (good, 5.25 h) | 79.1° 04:45 | 7.1 | 83% | 110.8° |
| 2026-08-24 Mon | 100 | 63 | 63 | 02:00–05:00 (good, 3.0 h) | 79.1° 04:45 | 7.16 | 90% | 99.1° |
| 2026-08-25 Tue | 100 | 98 | 98 | 00:00–05:00 (good, 5.0 h) | 79.1° 04:40 | 7.22 | 95% | 87.3° |
| 2026-08-26 Wed | 74 | 97 | 72 | 01:25–05:05 (good, 3.67 h) | 79.1° 04:35 | 7.27 | 98% | 75.4° |
| 2026-08-27 Thu | 58 | 98 | 57 | 04:25–05:05 (good, 0.67 h) | 79.1° 04:30 | 7.33 | 100% | 63.2° |
| 2026-08-28 Fri | 40 | 91 | 36 | 23:00–05:05 (marginal, 6.08 h) | 79.1° 04:25 | 7.39 | 99% | 50.9° |
| 2026-08-29 Sat | 28 | 4 | 1 | — | 79.1° 04:25 | 7.44 | 97% | 38.7° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-07-31&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.