← 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. |
|---|---|---|---|---|---|---|---|---|
| 2040-08-18 Sat | 0 | — | unknown | — | 42.9° 09:05 | 6.85 | 83% | 145.0° |
| 2040-08-19 Sun | 1 | — | unknown | — | 42.9° 09:00 | 6.91 | 91% | 136.4° |
| 2040-08-20 Mon | 1 | — | unknown | — | 42.9° 09:00 | 6.96 | 97% | 125.4° |
| 2040-08-21 Tue | 1 | — | unknown | — | 42.9° 08:55 | 7.02 | 100% | 113.2° |
| 2040-08-22 Wed | 1 | — | unknown | — | 42.9° 08:50 | 7.08 | 99% | 100.5° |
| 2040-08-23 Thu | 1 | — | unknown | — | 42.9° 08:45 | 7.14 | 96% | 87.9° |
| 2040-08-24 Fri | 1 | — | unknown | — | 42.9° 08:40 | 7.19 | 91% | 75.6° |
| 2040-08-25 Sat | 1 | — | unknown | — | 42.9° 08:40 | 7.25 | 84% | 63.9° |
| 2040-08-26 Sun | 1 | — | unknown | — | 42.9° 08:35 | 7.31 | 75% | 53.2° |
| 2040-08-27 Mon | 2 | — | unknown | — | 42.9° 08:30 | 7.36 | 65% | 43.7° |
| 2040-08-28 Tue | 2 | — | unknown | 04:55–05:05 (marginal, 0.17 h) | 42.9° 08:25 | 7.42 | 55% | 36.2° |
| 2040-08-29 Wed | 4 | — | unknown | 04:45–05:10 (marginal, 0.42 h) | 42.9° 08:20 | 7.48 | 46% | 31.6° |
| 2040-08-30 Thu | 5 | — | unknown | 04:35–05:10 (marginal, 0.58 h) | 42.9° 08:20 | 7.53 | 36% | 30.9° |
| 2040-08-31 Fri | 7 | — | unknown | 04:30–05:10 (marginal, 0.67 h) | 42.9° 08:15 | 7.59 | 27% | 34.2° |
| 2040-09-01 Sat | 11 | — | unknown | 05:05–05:15 (good, 0.17 h) | 42.9° 08:10 | 7.65 | 19% | 40.5° |
| 2040-09-02 Sun | 13 | — | unknown | 05:00–05:15 (good, 0.25 h) | 42.9° 08:05 | 7.7 | 12% | 48.5° |
| 2040-09-03 Mon | 16 | — | unknown | 04:50–05:15 (good, 0.42 h) | 42.9° 08:05 | 7.76 | 7% | 57.6° |
| 2040-09-04 Tue | 17 | — | unknown | 04:45–05:15 (good, 0.5 h) | 42.9° 08:00 | 7.81 | 3% | 67.4° |
| 2040-09-05 Wed | 21 | — | unknown | 04:40–05:20 (good, 0.67 h) | 42.9° 07:55 | 7.87 | 1% | 77.6° |
| 2040-09-06 Thu | 22 | — | unknown | 04:35–05:20 (good, 0.75 h) | 42.9° 07:50 | 7.92 | 0% | 88.1° |
| 2040-09-07 Fri | 24 | — | unknown | 04:35–05:20 (good, 0.75 h) | 42.9° 07:45 | 7.98 | 2% | 98.8° |
| 2040-09-08 Sat | 24 | — | unknown | 04:30–05:20 (good, 0.83 h) | 42.9° 07:45 | 8.03 | 5% | 109.6° |
| 2040-09-09 Sun | 27 | — | unknown | 04:25–05:25 (good, 1.0 h) | 42.9° 07:40 | 8.08 | 11% | 120.1° |
| 2040-09-10 Mon | 28 | — | unknown | 04:20–05:25 (good, 1.08 h) | 42.9° 07:35 | 8.14 | 18% | 130.3° |
| 2040-09-11 Tue | 30 | — | unknown | 04:15–05:25 (good, 1.17 h) | 42.9° 07:30 | 8.19 | 27% | 139.4° |
| 2040-09-12 Wed | 31 | — | unknown | 04:15–05:25 (good, 1.17 h) | 42.9° 07:25 | 8.25 | 37% | 146.3° |
| 2040-09-13 Thu | 33 | — | unknown | 04:10–05:30 (good, 1.33 h) | 42.9° 07:25 | 8.3 | 48% | 149.2° |
| 2040-09-14 Fri | 35 | — | unknown | 04:05–05:30 (good, 1.42 h) | 42.9° 07:20 | 8.35 | 60% | 146.7° |
| 2040-09-15 Sat | 36 | — | unknown | 04:00–05:30 (good, 1.5 h) | 42.9° 07:15 | 8.4 | 70% | 139.5° |
| 2040-09-16 Sun | 38 | — | unknown | 03:55–05:30 (good, 1.58 h) | 42.9° 07:10 | 8.46 | 80% | 129.5° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2040-08-18&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.