← 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. |
|---|---|---|---|---|---|---|---|---|
| 2025-05-09 Fri | 2 | 0 | 0 | — | 89.6° 10:50 | 5.89 | 93% | 147.7° |
| 2025-05-10 Sat | 3 | 0 | 0 | — | 89.5° 10:50 | 5.84 | 97% | 149.4° |
| 2025-05-11 Sun | 3 | 0 | 0 | — | 89.6° 10:45 | 5.78 | 99% | 147.2° |
| 2025-05-12 Mon | 3 | 0 | 0 | — | 89.7° 10:40 | 5.73 | 100% | 141.6° |
| 2025-05-13 Tue | 3 | 0 | 0 | — | 89.7° 10:35 | 5.67 | 98% | 133.9° |
| 2025-05-14 Wed | 4 | 100 | 4 | 03:55–04:10 (marginal, 0.25 h) | 89.5° 10:30 | 5.62 | 95% | 124.8° |
| 2025-05-15 Thu | 4 | 0 | 0 | — | 89.5° 10:30 | 5.56 | 90% | 115.0° |
| 2025-05-16 Fri | 4 | 0 | 0 | — | 89.7° 10:25 | 5.51 | 84% | 104.6° |
| 2025-05-17 Sat | 4 | 0 | 0 | — | 89.7° 10:20 | 5.46 | 76% | 93.8° |
| 2025-05-18 Sun | 4 | 100 | 4 | 03:40–04:00 (marginal, 0.33 h) | 89.6° 10:15 | 5.41 | 66% | 82.8° |
| 2025-05-19 Mon | 5 | 100 | 5 | 03:35–04:00 (marginal, 0.42 h) | 89.5° 10:10 | 5.36 | 56% | 71.6° |
| 2025-05-20 Tue | 6 | 72 | 4 | 03:30–04:00 (marginal, 0.5 h) | 89.6° 10:10 | 5.31 | 45% | 60.4° |
| 2025-05-21 Wed | 7 | 68 | 5 | 03:45–04:00 (marginal, 0.25 h) | 89.7° 10:05 | 5.26 | 34% | 49.6° |
| 2025-05-22 Thu | 7 | 89 | 6 | 03:25–03:55 (marginal, 0.5 h) | 89.7° 10:00 | 5.21 | 24% | 39.8° |
| 2025-05-23 Fri | 10 | 21 | 2 | — | 89.6° 09:55 | 5.16 | 15% | 32.7° |
| 2025-05-24 Sat | 11 | 0 | 0 | — | 89.5° 09:55 | 5.12 | 7% | 30.6° |
| 2025-05-25 Sun | 12 | 0 | 0 | — | 89.6° 09:50 | 5.07 | 2% | 34.8° |
| 2025-05-26 Mon | 12 | 80 | 10 | 03:10–03:50 (marginal, 0.67 h) | 89.7° 09:45 | 5.03 | 0% | 43.6° |
| 2025-05-27 Tue | 14 | 100 | 14 | 03:35–03:50 (good, 0.25 h) | 89.7° 09:40 | 4.98 | 1% | 54.6° |
| 2025-05-28 Wed | 15 | 89 | 13 | 03:45–03:50 (good, 0.08 h) | 89.5° 09:35 | 4.94 | 5% | 66.5° |
| 2025-05-29 Thu | 16 | 0 | 0 | — | 89.5° 09:35 | 4.9 | 11% | 78.6° |
| 2025-05-30 Fri | 17 | 30 | 5 | 03:30–03:45 (marginal, 0.25 h) | 89.7° 09:30 | 4.86 | 19% | 90.5° |
| 2025-05-31 Sat | 18 | 88 | 16 | 03:40–03:45 (good, 0.08 h) | 89.7° 09:25 | 4.82 | 28% | 102.1° |
| 2025-06-01 Sun | 19 | 4 | 1 | — | 89.6° 09:20 | 4.79 | 38% | 113.0° |
| 2025-06-02 Mon | 21 | 100 | 21 | 03:15–03:45 (good, 0.5 h) | 89.5° 09:15 | 4.75 | 48% | 123.3° |
| 2025-06-03 Tue | 23 | 100 | 23 | 03:10–03:45 (good, 0.58 h) | 89.6° 09:15 | 4.72 | 58% | 132.7° |
| 2025-06-04 Wed | 23 | 100 | 23 | 03:05–03:40 (good, 0.58 h) | 89.7° 09:10 | 4.69 | 67% | 140.8° |
| 2025-06-05 Thu | 24 | 51 | 12 | 03:00–03:40 (marginal, 0.67 h) | 89.7° 09:05 | 4.65 | 76% | 146.7° |
| 2025-06-06 Fri | 24 | 100 | 24 | 03:05–03:40 (good, 0.58 h) | 89.6° 09:00 | 4.63 | 83% | 149.5° |
| 2025-06-07 Sat | 25 | 100 | 25 | 03:00–03:40 (good, 0.67 h) | 89.5° 09:00 | 4.6 | 90% | 148.2° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2025-05-09&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.