← 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. |
|---|---|---|---|---|---|---|---|---|
| 2027-04-04 Sun | 7 | — | unknown | 20:55–21:55 (marginal, 1.0 h) | 72.5° 16:20 | 7.93 | 5% | 69.4° |
| 2027-04-05 Mon | 6 | — | unknown | 21:30–21:55 (marginal, 0.42 h) | 72.5° 16:15 | 7.87 | 1% | 56.6° |
| 2027-04-06 Tue | 5 | — | unknown | 21:30–21:50 (marginal, 0.33 h) | 72.5° 16:10 | 7.82 | 0% | 43.5° |
| 2027-04-07 Wed | 4 | — | unknown | 20:55–21:20 (marginal, 0.42 h) | 72.5° 16:05 | 7.76 | 1% | 30.1° |
| 2027-04-08 Thu | 3 | — | unknown | 21:00–21:10 (marginal, 0.17 h) | 72.5° 16:05 | 7.71 | 5% | 16.5° |
| 2027-04-09 Fri | 2 | — | unknown | 21:00–21:05 (marginal, 0.08 h) | 72.5° 16:00 | 7.65 | 10% | 2.8° |
| 2027-04-10 Sat | 1 | — | unknown | — | 72.5° 15:55 | 7.59 | 18% | 11.3° |
| 2027-04-11 Sun | 1 | — | unknown | — | 72.5° 15:50 | 7.54 | 28% | 25.4° |
| 2027-04-12 Mon | 1 | — | unknown | — | 72.5° 15:45 | 7.48 | 38% | 39.5° |
| 2027-04-13 Tue | 0 | — | unknown | — | 72.5° 15:45 | 7.42 | 50% | 53.6° |
| 2027-04-14 Wed | 0 | — | unknown | — | 72.5° 15:40 | 7.36 | 61% | 67.8° |
| 2027-04-15 Thu | 0 | — | unknown | — | 72.5° 15:35 | 7.31 | 72% | 81.9° |
| 2027-04-16 Fri | 0 | — | unknown | — | 72.5° 15:30 | 7.25 | 81% | 96.0° |
| 2027-04-17 Sat | 0 | — | unknown | — | 72.5° 15:25 | 7.19 | 89% | 110.0° |
| 2027-04-18 Sun | 0 | — | unknown | — | 72.5° 15:25 | 7.13 | 95% | 123.8° |
| 2027-04-19 Mon | 0 | — | unknown | — | 72.5° 15:20 | 7.08 | 99% | 137.5° |
| 2027-04-20 Tue | 0 | — | unknown | — | 72.5° 15:15 | 7.02 | 100% | 150.9° |
| 2027-04-21 Wed | 0 | — | unknown | — | 72.5° 15:10 | 6.96 | 99% | 164.0° |
| 2027-04-22 Thu | 0 | — | unknown | — | 72.5° 15:10 | 6.9 | 96% | 176.8° |
| 2027-04-23 Fri | 0 | — | unknown | — | 72.5° 15:05 | 6.84 | 90% | 170.5° |
| 2027-04-24 Sat | 0 | — | unknown | — | 72.5° 15:00 | 6.78 | 84% | 158.2° |
| 2027-04-25 Sun | 0 | — | unknown | — | 72.5° 14:55 | 6.73 | 76% | 146.1° |
| 2027-04-26 Mon | 0 | — | unknown | — | 72.5° 14:50 | 6.67 | 68% | 134.1° |
| 2027-04-27 Tue | 0 | — | unknown | — | 72.5° 14:50 | 6.61 | 59% | 122.3° |
| 2027-04-28 Wed | 0 | — | unknown | — | 72.5° 14:45 | 6.55 | 49% | 110.4° |
| 2027-04-29 Thu | 0 | — | unknown | — | 72.5° 14:40 | 6.49 | 40% | 98.5° |
| 2027-04-30 Fri | 0 | — | unknown | — | 72.5° 14:35 | 6.43 | 31% | 86.4° |
| 2027-05-01 Sat | 0 | — | unknown | — | 72.5° 14:30 | 6.38 | 22% | 74.1° |
| 2027-05-02 Sun | 0 | — | unknown | — | 72.5° 14:30 | 6.32 | 14% | 61.5° |
| 2027-05-03 Mon | 0 | — | unknown | — | 72.5° 14:25 | 6.26 | 8% | 48.5° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2027-04-04&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.