← 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. |
|---|---|---|---|---|---|---|---|---|
| 2041-09-03 Tue | 0 | — | unknown | — | 50.1° 15:00 | 7.74 | 52% | 68.8° |
| 2041-09-04 Wed | 0 | — | unknown | — | 50.1° 14:55 | 7.8 | 63% | 82.2° |
| 2041-09-05 Thu | 0 | — | unknown | — | 50.1° 14:50 | 7.85 | 73% | 96.0° |
| 2041-09-06 Fri | 0 | — | unknown | — | 50.1° 14:50 | 7.91 | 83% | 110.3° |
| 2041-09-07 Sat | 0 | — | unknown | — | 50.1° 14:45 | 7.96 | 91% | 125.0° |
| 2041-09-08 Sun | 0 | — | unknown | — | 50.1° 14:40 | 8.02 | 96% | 140.0° |
| 2041-09-09 Mon | 0 | — | unknown | — | 50.1° 14:35 | 8.07 | 100% | 155.2° |
| 2041-09-10 Tue | 0 | — | unknown | — | 50.1° 14:35 | 8.13 | 100% | 170.3° |
| 2041-09-11 Wed | 0 | — | unknown | — | 50.1° 14:30 | 8.18 | 96% | 174.0° |
| 2041-09-12 Thu | 0 | — | unknown | — | 50.1° 14:25 | 8.23 | 91% | 159.4° |
| 2041-09-13 Fri | 0 | — | unknown | — | 50.1° 14:20 | 8.29 | 83% | 145.1° |
| 2041-09-14 Sat | 0 | — | unknown | — | 50.1° 14:15 | 8.34 | 74% | 131.1° |
| 2041-09-15 Sun | 0 | — | unknown | — | 50.1° 14:15 | 8.39 | 63% | 117.7° |
| 2041-09-16 Mon | 0 | — | unknown | — | 50.1° 14:10 | 8.44 | 53% | 104.6° |
| 2041-09-17 Tue | 0 | — | unknown | — | 50.1° 14:05 | 8.5 | 43% | 92.0° |
| 2041-09-18 Wed | 0 | — | unknown | — | 50.1° 14:00 | 8.55 | 33% | 79.7° |
| 2041-09-19 Thu | 0 | — | unknown | — | 50.1° 13:55 | 8.6 | 25% | 67.6° |
| 2041-09-20 Fri | 0 | — | unknown | — | 50.1° 13:55 | 8.65 | 17% | 55.6° |
| 2041-09-21 Sat | 0 | — | unknown | — | 50.1° 13:50 | 8.7 | 10% | 43.8° |
| 2041-09-22 Sun | 0 | — | unknown | — | 50.1° 13:45 | 8.75 | 5% | 32.0° |
| 2041-09-23 Mon | 0 | — | unknown | — | 50.1° 13:40 | 8.8 | 2% | 20.2° |
| 2041-09-24 Tue | 0 | — | unknown | — | 50.1° 13:40 | 8.85 | 0% | 8.5° |
| 2041-09-25 Wed | 0 | — | unknown | — | 50.1° 13:35 | 8.9 | 0% | 4.2° |
| 2041-09-26 Thu | 0 | — | unknown | — | 50.1° 13:30 | 8.95 | 2% | 15.9° |
| 2041-09-27 Fri | 0 | — | unknown | — | 50.1° 13:25 | 9.0 | 6% | 28.0° |
| 2041-09-28 Sat | 0 | — | unknown | — | 50.1° 13:20 | 9.05 | 12% | 40.3° |
| 2041-09-29 Sun | 0 | — | unknown | — | 50.1° 13:20 | 9.1 | 19% | 52.8° |
| 2041-09-30 Mon | 0 | — | unknown | — | 50.1° 13:15 | 9.15 | 27% | 65.5° |
| 2041-10-01 Tue | 0 | — | unknown | — | 50.1° 13:10 | 9.2 | 37% | 78.5° |
| 2041-10-02 Wed | 0 | — | unknown | — | 50.1° 13:05 | 9.24 | 48% | 91.8° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2041-09-03&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.