← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-08-04 Tue | 0 | 0 | 0 | — | 42.9° 10:00 | 6.01 | 63% | 62.6° |
| 2026-08-05 Wed | 0 | 0 | 0 | — | 42.9° 10:00 | 6.07 | 52% | 52.3° |
| 2026-08-06 Thu | 0 | 0 | 0 | — | 42.9° 09:55 | 6.13 | 40% | 43.1° |
| 2026-08-07 Fri | 0 | 0 | 0 | — | 42.9° 09:50 | 6.18 | 30% | 36.2° |
| 2026-08-08 Sat | 0 | 0 | 0 | — | 42.9° 09:45 | 6.24 | 19% | 33.5° |
| 2026-08-09 Sun | 0 | 0 | 0 | — | 42.9° 09:45 | 6.3 | 11% | 36.2° |
| 2026-08-10 Mon | 0 | 0 | 0 | — | 42.9° 09:40 | 6.35 | 5% | 43.4° |
| 2026-08-11 Tue | 0 | 100 | 0 | — | 42.9° 09:35 | 6.41 | 1% | 53.2° |
| 2026-08-12 Wed | 0 | 100 | 0 | — | 42.9° 09:30 | 6.47 | 0% | 64.3° |
| 2026-08-13 Thu | 0 | 0 | 0 | — | 42.9° 09:25 | 6.53 | 2% | 75.8° |
| 2026-08-14 Fri | 0 | 82 | 0 | — | 42.9° 09:25 | 6.58 | 6% | 87.4° |
| 2026-08-15 Sat | 0 | 100 | 0 | — | 42.9° 09:20 | 6.64 | 12% | 98.6° |
| 2026-08-16 Sun | 0 | 100 | 0 | — | 42.9° 09:15 | 6.7 | 20% | 109.4° |
| 2026-08-17 Mon | 0 | 100 | 0 | — | 42.9° 09:10 | 6.76 | 29% | 119.5° |
| 2026-08-18 Tue | 0 | 22 | 0 | — | 42.9° 09:05 | 6.81 | 39% | 128.7° |
| 2026-08-19 Wed | 1 | 100 | 1 | — | 42.9° 09:05 | 6.87 | 48% | 136.6° |
| 2026-08-20 Thu | 1 | 100 | 1 | — | 42.9° 09:00 | 6.93 | 58% | 142.7° |
| 2026-08-21 Fri | 1 | 100 | 1 | — | 42.9° 08:55 | 6.99 | 67% | 146.1° |
| 2026-08-22 Sat | 1 | 100 | 1 | — | 42.9° 08:50 | 7.04 | 76% | 146.0° |
| 2026-08-23 Sun | 2 | 53 | 1 | — | 42.9° 08:50 | 7.1 | 83% | 142.4° |
| 2026-08-24 Mon | 2 | 100 | 2 | 05:30–05:40 (marginal, 0.17 h) | 42.9° 08:45 | 7.16 | 90% | 136.1° |
| 2026-08-25 Tue | 3 | 94 | 3 | 05:30–05:40 (marginal, 0.17 h) | 42.9° 08:40 | 7.22 | 95% | 128.0° |
| 2026-08-26 Wed | 4 | 98 | 4 | 04:50–05:05 (marginal, 0.25 h) | 42.9° 08:35 | 7.27 | 98% | 118.7° |
| 2026-08-27 Thu | 4 | 99 | 4 | 04:45–05:05 (marginal, 0.33 h) | 42.9° 08:30 | 7.33 | 100% | 108.6° |
| 2026-08-28 Fri | 3 | 85 | 3 | 05:00–05:05 (marginal, 0.08 h) | 42.9° 08:30 | 7.39 | 99% | 98.0° |
| 2026-08-29 Sat | 4 | 0 | 0 | — | 42.9° 08:25 | 7.44 | 97% | 87.1° |
| 2026-08-30 Sun | 3 | 100 | 3 | 04:50–05:10 (marginal, 0.33 h) | 42.9° 08:20 | 7.5 | 92% | 76.1° |
| 2026-08-31 Mon | 3 | 100 | 3 | 04:50–05:10 (marginal, 0.33 h) | 42.9° 08:15 | 7.56 | 85% | 65.1° |
| 2026-09-01 Tue | 4 | 75 | 3 | — | 42.9° 08:10 | 7.61 | 76% | 54.6° |
| 2026-09-02 Wed | 4 | 0 | 0 | — | 42.9° 08:10 | 7.67 | 66% | 45.1° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-08-04&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.