← 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. |
|---|---|---|---|---|---|---|---|---|
| 2026-04-26 Sun | 100 | 100 | 100 | 00:05–04:40 (good, 4.58 h) | 87.1° 05:40 | 6.65 | 78% | 105.6° |
| 2026-04-27 Mon | 100 | 72 | 72 | 01:00–03:00 (good, 2.0 h) | 87.1° 05:35 | 6.6 | 86% | 101.1° |
| 2026-04-28 Tue | 84 | 64 | 54 | 04:00–04:35 (good, 0.58 h) | 87.1° 05:30 | 6.54 | 92% | 96.2° |
| 2026-04-29 Wed | 80 | 38 | 31 | 23:20–02:00 (marginal, 2.67 h) | 87.1° 05:25 | 6.48 | 97% | 91.1° |
| 2026-04-30 Thu | 74 | 0 | 0 | — | 87.1° 05:25 | 6.42 | 99% | 86.0° |
| 2026-05-01 Fri | 68 | 54 | 36 | 02:00–04:00 (good, 2.0 h) | 87.1° 05:20 | 6.36 | 100% | 81.1° |
| 2026-05-02 Sat | 66 | 0 | 0 | — | 87.1° 05:15 | 6.31 | 98% | 76.7° |
| 2026-05-03 Sun | 66 | 66 | 44 | 02:00–04:30 (good, 2.5 h) | 87.1° 05:10 | 6.25 | 95% | 72.7° |
| 2026-05-04 Mon | 76 | 24 | 18 | 03:00–04:25 (marginal, 1.42 h) | 87.1° 05:05 | 6.19 | 91% | 69.5° |
| 2026-05-05 Tue | 86 | 100 | 86 | 23:10–04:25 (good, 5.25 h) | 87.1° 05:05 | 6.13 | 84% | 67.1° |
| 2026-05-06 Wed | 92 | 98 | 90 | 23:05–04:20 (good, 5.25 h) | 87.1° 05:00 | 6.08 | 77% | 65.8° |
| 2026-05-07 Thu | 97 | 36 | 35 | 23:05–01:00 (good, 1.92 h) | 87.1° 04:55 | 6.02 | 69% | 65.5° |
| 2026-05-08 Fri | 100 | 16 | 16 | 02:00–04:00 (marginal, 2.0 h) | 87.1° 04:50 | 5.96 | 59% | 66.4° |
| 2026-05-09 Sat | 100 | 81 | 81 | 00:00–04:00 (good, 4.0 h) | 87.1° 04:45 | 5.91 | 50% | 68.4° |
| 2026-05-10 Sun | 100 | 42 | 42 | 02:00–03:00 (good, 1.0 h) | 87.1° 04:45 | 5.85 | 40% | 71.5° |
| 2026-05-11 Mon | 100 | 27 | 27 | 22:50–00:00 (good, 1.17 h) | 87.1° 04:40 | 5.79 | 30% | 75.6° |
| 2026-05-12 Tue | 100 | 93 | 93 | 23:00–04:10 (good, 5.17 h) | 87.1° 04:35 | 5.74 | 20% | 80.6° |
| 2026-05-13 Wed | 100 | 2 | 2 | — | 87.1° 04:30 | 5.68 | 12% | 86.2° |
| 2026-05-14 Thu | 100 | 70 | 70 | 22:45–02:00 (good, 3.25 h) | 87.1° 04:30 | 5.63 | 5% | 92.2° |
| 2026-05-15 Fri | 100 | 68 | 68 | 22:30–02:00 (good, 3.5 h) | 87.1° 04:25 | 5.58 | 1% | 98.2° |
| 2026-05-16 Sat | 100 | 73 | 73 | 00:00–04:05 (good, 4.08 h) | 87.1° 04:20 | 5.52 | 0% | 103.9° |
| 2026-05-17 Sun | 100 | 2 | 2 | — | 87.1° 04:15 | 5.47 | 2% | 108.7° |
| 2026-05-18 Mon | 100 | 3 | 3 | — | 87.1° 04:10 | 5.42 | 7% | 112.3° |
| 2026-05-19 Tue | 100 | 0 | 0 | — | 87.1° 04:10 | 5.37 | 14% | 114.3° |
| 2026-05-20 Wed | 100 | 74 | 74 | 22:40–04:00 (good, 5.33 h) | 87.1° 04:05 | 5.32 | 23% | 114.6° |
| 2026-05-21 Thu | 100 | 13 | 13 | 22:40–00:00 (marginal, 1.33 h) | 87.1° 04:00 | 5.27 | 33% | 113.2° |
| 2026-05-22 Fri | 100 | 6 | 6 | — | 87.1° 03:55 | 5.22 | 44% | 110.5° |
| 2026-05-23 Sat | 100 | 46 | 46 | 01:00–02:00 (good, 1.0 h) | 87.1° 03:50 | 5.17 | 55% | 106.8° |
| 2026-05-24 Sun | 100 | 81 | 81 | 01:00–03:55 (good, 2.92 h) | 87.1° 03:50 | 5.13 | 65% | 102.4° |
| 2026-05-25 Mon | 100 | 40 | 40 | 01:00–03:00 (marginal, 2.0 h) | 87.1° 03:45 | 5.08 | 74% | 97.5° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-04-26&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.