← 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. |
|---|---|---|---|---|---|---|---|---|
| 2031-05-04 Sun | 1 | — | unknown | — | 89.6° 11:15 | 6.2 | 94% | 147.9° |
| 2031-05-05 Mon | 1 | — | unknown | — | 89.7° 11:10 | 6.14 | 98% | 149.2° |
| 2031-05-06 Tue | 1 | — | unknown | — | 89.7° 11:05 | 6.09 | 100% | 144.9° |
| 2031-05-07 Wed | 2 | — | unknown | — | 89.6° 11:00 | 6.03 | 99% | 136.4° |
| 2031-05-08 Thu | 2 | — | unknown | — | 89.5° 11:00 | 5.97 | 96% | 125.6° |
| 2031-05-09 Fri | 2 | — | unknown | — | 89.7° 10:55 | 5.92 | 89% | 113.7° |
| 2031-05-10 Sat | 2 | — | unknown | — | 89.7° 10:50 | 5.86 | 81% | 101.3° |
| 2031-05-11 Sun | 2 | — | unknown | 04:10–04:15 (marginal, 0.08 h) | 89.7° 10:45 | 5.81 | 71% | 88.8° |
| 2031-05-12 Mon | 2 | — | unknown | 04:05–04:10 (marginal, 0.08 h) | 89.5° 10:40 | 5.75 | 60% | 76.6° |
| 2031-05-13 Tue | 3 | — | unknown | 04:00–04:10 (marginal, 0.17 h) | 89.6° 10:40 | 5.7 | 48% | 64.8° |
| 2031-05-14 Wed | 3 | — | unknown | 03:55–04:10 (marginal, 0.25 h) | 89.7° 10:35 | 5.64 | 38% | 53.8° |
| 2031-05-15 Thu | 3 | — | unknown | 03:55–04:05 (marginal, 0.17 h) | 89.7° 10:30 | 5.59 | 27% | 44.0° |
| 2031-05-16 Fri | 4 | — | unknown | 04:30–04:50 (marginal, 0.33 h) | 89.7° 10:25 | 5.54 | 18% | 36.0° |
| 2031-05-17 Sat | 6 | — | unknown | 03:45–04:05 (marginal, 0.33 h) | 89.5° 10:20 | 5.48 | 11% | 31.3° |
| 2031-05-18 Sun | 7 | — | unknown | 04:15–04:50 (marginal, 0.58 h) | 89.6° 10:20 | 5.43 | 6% | 31.0° |
| 2031-05-19 Mon | 7 | — | unknown | 04:10–04:45 (marginal, 0.58 h) | 89.7° 10:15 | 5.38 | 2% | 35.1° |
| 2031-05-20 Tue | 7 | — | unknown | 04:05–04:45 (marginal, 0.67 h) | 89.7° 10:10 | 5.33 | 0% | 42.1° |
| 2031-05-21 Wed | 8 | — | unknown | 04:05–04:45 (marginal, 0.67 h) | 89.6° 10:05 | 5.28 | 0% | 50.7° |
| 2031-05-22 Thu | 9 | — | unknown | 04:00–04:45 (marginal, 0.75 h) | 89.5° 10:05 | 5.23 | 2% | 60.1° |
| 2031-05-23 Fri | 10 | — | unknown | 03:20–04:45 (marginal, 1.42 h) | 89.7° 10:00 | 5.18 | 6% | 70.0° |
| 2031-05-24 Sat | 10 | — | unknown | 03:50–03:55 (good, 0.08 h) | 89.7° 09:55 | 5.14 | 12% | 80.1° |
| 2031-05-25 Sun | 11 | — | unknown | 03:45–03:55 (good, 0.17 h) | 89.7° 09:50 | 5.09 | 18% | 90.2° |
| 2031-05-26 Mon | 12 | — | unknown | 03:45–03:50 (good, 0.08 h) | 89.6° 09:45 | 5.05 | 26% | 100.4° |
| 2031-05-27 Tue | 13 | — | unknown | 03:40–03:50 (good, 0.17 h) | 89.6° 09:45 | 5.0 | 35% | 110.6° |
| 2031-05-28 Wed | 15 | — | unknown | 03:35–03:50 (good, 0.25 h) | 89.7° 09:40 | 4.96 | 45% | 120.5° |
| 2031-05-29 Thu | 16 | — | unknown | 03:30–03:50 (good, 0.33 h) | 89.7° 09:35 | 4.92 | 55% | 130.2° |
| 2031-05-30 Fri | 15 | — | unknown | 03:30–03:45 (good, 0.25 h) | 89.7° 09:30 | 4.88 | 65% | 139.0° |
| 2031-05-31 Sat | 17 | — | unknown | 03:25–03:45 (good, 0.33 h) | 89.5° 09:25 | 4.84 | 74% | 146.0° |
| 2031-06-01 Sun | 18 | — | unknown | 03:20–03:45 (good, 0.42 h) | 89.6° 09:25 | 4.8 | 83% | 149.4° |
| 2031-06-02 Mon | 17 | — | unknown | 03:25–03:45 (good, 0.33 h) | 89.7° 09:20 | 4.77 | 91% | 147.4° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2031-05-04&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.