← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-05-31 Sun | 14 | 98 | 14 | 03:35–03:45 (good, 0.17 h) | 89.6° 09:25 | 4.83 | 100% | 126.5° |
| 2026-06-01 Mon | 15 | 25 | 4 | — | 89.5° 09:20 | 4.79 | 98% | 116.8° |
| 2026-06-02 Tue | 15 | 86 | 13 | 02:45–04:00 (marginal, 1.25 h) | 89.6° 09:20 | 4.76 | 94% | 106.8° |
| 2026-06-03 Wed | 14 | 43 | 6 | — | 89.7° 09:15 | 4.73 | 89% | 96.5° |
| 2026-06-04 Thu | 14 | 10 | 1 | — | 89.7° 09:10 | 4.69 | 82% | 86.0° |
| 2026-06-05 Fri | 14 | 86 | 12 | 02:40–03:40 (marginal, 1.0 h) | 89.6° 09:05 | 4.66 | 74% | 75.4° |
| 2026-06-06 Sat | 14 | 69 | 10 | 03:00–03:40 (marginal, 0.67 h) | 89.5° 09:05 | 4.63 | 65% | 64.8° |
| 2026-06-07 Sun | 15 | 97 | 15 | 02:20–03:40 (marginal, 1.33 h) | 89.6° 09:00 | 4.61 | 55% | 54.4° |
| 2026-06-08 Mon | 17 | 1 | 0 | — | 89.7° 08:55 | 4.58 | 45% | 44.5° |
| 2026-06-09 Tue | 20 | 98 | 20 | 03:05–03:40 (good, 0.58 h) | 89.7° 08:50 | 4.56 | 34% | 35.8° |
| 2026-06-10 Wed | 24 | 99 | 24 | 02:55–03:40 (good, 0.75 h) | 89.5° 08:45 | 4.53 | 24% | 30.1° |
| 2026-06-11 Thu | 28 | 10 | 3 | — | 89.5° 08:45 | 4.51 | 15% | 29.8° |
| 2026-06-12 Fri | 32 | 0 | 0 | — | 89.7° 08:40 | 4.49 | 7% | 35.5° |
| 2026-06-13 Sat | 34 | 94 | 32 | 02:40–03:40 (good, 1.0 h) | 89.7° 08:35 | 4.48 | 2% | 45.3° |
| 2026-06-14 Sun | 35 | 91 | 32 | 02:55–03:40 (good, 0.75 h) | 89.6° 08:30 | 4.46 | 0% | 57.1° |
| 2026-06-15 Mon | 37 | 61 | 23 | 03:00–03:40 (good, 0.67 h) | 89.5° 08:25 | 4.45 | 1% | 69.8° |
| 2026-06-16 Tue | 38 | 0 | 0 | — | 89.6° 08:25 | 4.44 | 5% | 82.9° |
| 2026-06-17 Wed | 39 | 67 | 26 | 03:00–03:40 (good, 0.67 h) | 89.7° 08:20 | 4.43 | 12% | 95.8° |
| 2026-06-18 Thu | 41 | 69 | 28 | 02:30–03:40 (good, 1.17 h) | 89.7° 08:15 | 4.43 | 20% | 108.2° |
| 2026-06-19 Fri | 42 | 96 | 40 | 02:15–03:40 (good, 1.42 h) | 89.6° 08:10 | 4.42 | 30% | 120.0° |
| 2026-06-20 Sat | 44 | 99 | 44 | 02:05–03:40 (good, 1.58 h) | 89.5° 08:10 | 4.42 | 40% | 130.7° |
| 2026-06-21 Sun | 46 | 99 | 46 | 02:00–03:40 (good, 1.67 h) | 89.6° 08:05 | 4.42 | 50% | 140.1° |
| 2026-06-22 Mon | 47 | 84 | 39 | 02:00–03:00 (good, 1.0 h) | 89.7° 08:00 | 4.42 | 60% | 147.1° |
| 2026-06-23 Tue | 48 | 82 | 39 | 02:00–03:00 (good, 1.0 h) | 89.7° 07:55 | 4.43 | 70% | 150.7° |
| 2026-06-24 Wed | 49 | 90 | 44 | 02:15–03:40 (good, 1.42 h) | 89.6° 07:50 | 4.43 | 78% | 149.8° |
| 2026-06-25 Thu | 50 | 91 | 46 | 02:00–03:40 (good, 1.67 h) | 89.5° 07:50 | 4.44 | 86% | 145.0° |
| 2026-06-26 Fri | 52 | 99 | 51 | 01:50–03:40 (good, 1.83 h) | 89.7° 07:45 | 4.45 | 92% | 137.6° |
| 2026-06-27 Sat | 47 | 47 | 22 | 02:10–03:00 (good, 0.83 h) | 89.7° 07:40 | 4.47 | 96% | 128.8° |
| 2026-06-28 Sun | 47 | 100 | 47 | 01:45–03:40 (good, 1.92 h) | 89.7° 07:35 | 4.48 | 99% | 119.3° |
| 2026-06-29 Mon | 43 | 91 | 39 | 02:00–03:40 (good, 1.67 h) | 89.5° 07:30 | 4.5 | 100% | 109.2° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-05-31&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.