← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-05-04 Mon | 50 | 38 | 19 | 04:00–04:25 (good, 0.42 h) | 87.3° 07:30 | 6.19 | 91% | 88.6° |
| 2026-05-05 Tue | 50 | 100 | 50 | 01:35–04:25 (good, 2.83 h) | 87.3° 07:25 | 6.13 | 84% | 82.2° |
| 2026-05-06 Wed | 53 | 98 | 52 | 01:30–04:20 (good, 2.83 h) | 87.3° 07:20 | 6.08 | 77% | 76.0° |
| 2026-05-07 Thu | 62 | 9 | 6 | 00:25–01:00 (marginal, 0.58 h) | 87.3° 07:15 | 6.02 | 69% | 70.2° |
| 2026-05-08 Fri | 68 | 23 | 16 | 02:00–04:00 (marginal, 2.0 h) | 87.3° 07:15 | 5.96 | 59% | 65.1° |
| 2026-05-09 Sat | 74 | 82 | 61 | 01:00–04:00 (good, 3.0 h) | 87.3° 07:10 | 5.91 | 50% | 60.9° |
| 2026-05-10 Sun | 80 | 45 | 36 | 02:00–03:00 (good, 1.0 h) | 87.3° 07:05 | 5.85 | 40% | 58.0° |
| 2026-05-11 Mon | 86 | 7 | 6 | 00:40–01:00 (marginal, 0.33 h) | 87.3° 07:00 | 5.79 | 30% | 56.8° |
| 2026-05-12 Tue | 90 | 96 | 86 | 00:45–04:10 (good, 3.42 h) | 87.3° 06:55 | 5.74 | 20% | 57.6° |
| 2026-05-13 Wed | 94 | 0 | 0 | — | 87.3° 06:55 | 5.68 | 12% | 60.5° |
| 2026-05-14 Thu | 97 | 59 | 57 | 00:35–02:00 (good, 1.42 h) | 87.3° 06:50 | 5.63 | 5% | 65.3° |
| 2026-05-15 Fri | 97 | 57 | 55 | 00:50–02:00 (good, 1.17 h) | 87.3° 06:45 | 5.58 | 1% | 71.8° |
| 2026-05-16 Sat | 99 | 84 | 83 | 01:00–04:05 (good, 3.08 h) | 87.3° 06:40 | 5.52 | 0% | 79.4° |
| 2026-05-17 Sun | 100 | 0 | 0 | — | 87.3° 06:40 | 5.47 | 2% | 87.5° |
| 2026-05-18 Mon | 100 | 5 | 5 | — | 87.3° 06:35 | 5.42 | 7% | 95.8° |
| 2026-05-19 Tue | 100 | 0 | 0 | — | 87.3° 06:30 | 5.37 | 14% | 103.7° |
| 2026-05-20 Wed | 100 | 68 | 68 | 01:15–02:00 (good, 0.75 h) | 87.3° 06:25 | 5.32 | 23% | 110.7° |
| 2026-05-21 Thu | 100 | 4 | 4 | — | 87.3° 06:20 | 5.27 | 33% | 116.5° |
| 2026-05-22 Fri | 100 | 5 | 5 | — | 87.3° 06:20 | 5.22 | 44% | 120.6° |
| 2026-05-23 Sat | 100 | 45 | 45 | 01:00–02:00 (good, 1.0 h) | 87.3° 06:15 | 5.17 | 55% | 122.9° |
| 2026-05-24 Sun | 100 | 85 | 85 | 01:00–03:55 (good, 2.92 h) | 87.3° 06:10 | 5.13 | 65% | 123.2° |
| 2026-05-25 Mon | 100 | 43 | 43 | 02:40–03:00 (good, 0.33 h) | 87.3° 06:05 | 5.08 | 74% | 121.7° |
| 2026-05-26 Tue | 100 | 80 | 80 | 00:15–03:00 (good, 2.75 h) | 87.3° 06:00 | 5.04 | 83% | 118.6° |
| 2026-05-27 Wed | 100 | 77 | 77 | 03:00–03:50 (good, 0.83 h) | 87.3° 06:00 | 4.99 | 89% | 114.2° |
| 2026-05-28 Thu | 86 | 99 | 85 | 00:00–03:50 (good, 3.83 h) | 87.3° 05:55 | 4.95 | 94% | 108.9° |
| 2026-05-29 Fri | 79 | 92 | 72 | 01:00–03:50 (good, 2.83 h) | 87.3° 05:50 | 4.91 | 98% | 103.0° |
| 2026-05-30 Sat | 73 | 65 | 48 | 02:00–03:45 (good, 1.75 h) | 87.3° 05:45 | 4.87 | 100% | 96.7° |
| 2026-05-31 Sun | 67 | 96 | 64 | 00:40–03:45 (good, 3.08 h) | 87.3° 05:40 | 4.83 | 100% | 90.2° |
| 2026-06-01 Mon | 63 | 31 | 20 | 23:00–01:00 (marginal, 2.0 h) | 87.3° 05:40 | 4.79 | 98% | 83.8° |
| 2026-06-02 Tue | 61 | 88 | 54 | 03:00–03:45 (good, 0.75 h) | 87.3° 05:35 | 4.76 | 94% | 77.4° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-05-04&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.