← 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. |
|---|---|---|---|---|---|---|---|---|
| 2027-03-27 Sat | 21 | — | unknown | 20:20–20:55 (good, 0.58 h) | 42.9° 17:40 | 8.37 | 70% | 145.5° |
| 2027-03-28 Sun | 19 | — | unknown | 21:20–21:55 (good, 0.58 h) | 42.9° 18:35 | 8.31 | 60% | 147.1° |
| 2027-03-29 Mon | 17 | — | unknown | 21:20–21:50 (good, 0.5 h) | 42.9° 18:30 | 8.26 | 51% | 144.9° |
| 2027-03-30 Tue | 15 | — | unknown | 21:20–21:45 (good, 0.42 h) | 42.9° 18:25 | 8.2 | 42% | 139.6° |
| 2027-03-31 Wed | 13 | — | unknown | 21:25–21:40 (good, 0.25 h) | 42.9° 18:25 | 8.15 | 32% | 132.3° |
| 2027-04-01 Thu | 12 | — | unknown | 21:25–21:40 (good, 0.25 h) | 42.9° 18:20 | 8.1 | 24% | 123.7° |
| 2027-04-02 Fri | 10 | — | unknown | 21:25–21:35 (good, 0.17 h) | 42.9° 18:15 | 8.04 | 16% | 114.2° |
| 2027-04-03 Sat | 9 | — | unknown | 21:25–21:30 (good, 0.08 h) | 42.9° 18:10 | 7.99 | 10% | 104.2° |
| 2027-04-04 Sun | 7 | — | unknown | 21:30–21:55 (marginal, 0.42 h) | 42.9° 18:05 | 7.93 | 5% | 93.7° |
| 2027-04-05 Mon | 6 | — | unknown | 21:30–21:55 (marginal, 0.42 h) | 42.9° 18:05 | 7.87 | 1% | 83.0° |
| 2027-04-06 Tue | 5 | — | unknown | 21:30–21:50 (marginal, 0.33 h) | 42.9° 18:00 | 7.82 | 0% | 72.1° |
| 2027-04-07 Wed | 4 | — | unknown | 21:30–21:45 (marginal, 0.25 h) | 42.9° 17:55 | 7.76 | 1% | 61.3° |
| 2027-04-08 Thu | 3 | — | unknown | 21:00–21:10 (marginal, 0.17 h) | 42.9° 17:50 | 7.71 | 5% | 51.0° |
| 2027-04-09 Fri | 2 | — | unknown | — | 42.9° 17:45 | 7.65 | 10% | 41.9° |
| 2027-04-10 Sat | 1 | — | unknown | — | 42.9° 17:45 | 7.59 | 18% | 35.3° |
| 2027-04-11 Sun | 1 | — | unknown | — | 42.9° 17:40 | 7.54 | 28% | 32.8° |
| 2027-04-12 Mon | 0 | — | unknown | — | 42.9° 17:35 | 7.48 | 38% | 35.5° |
| 2027-04-13 Tue | 0 | — | unknown | — | 42.9° 17:30 | 7.42 | 50% | 42.4° |
| 2027-04-14 Wed | 0 | — | unknown | — | 42.9° 17:30 | 7.36 | 61% | 51.9° |
| 2027-04-15 Thu | 0 | — | unknown | — | 42.9° 17:25 | 7.31 | 72% | 62.7° |
| 2027-04-16 Fri | 0 | — | unknown | — | 42.9° 17:20 | 7.25 | 81% | 74.1° |
| 2027-04-17 Sat | 0 | — | unknown | — | 42.9° 17:15 | 7.19 | 89% | 85.8° |
| 2027-04-18 Sun | 0 | — | unknown | — | 42.9° 17:10 | 7.13 | 95% | 97.4° |
| 2027-04-19 Mon | 0 | — | unknown | — | 42.9° 17:10 | 7.08 | 99% | 108.7° |
| 2027-04-20 Tue | 0 | — | unknown | — | 42.9° 17:05 | 7.02 | 100% | 119.5° |
| 2027-04-21 Wed | 0 | — | unknown | — | 42.9° 17:00 | 6.96 | 99% | 129.4° |
| 2027-04-22 Thu | 0 | — | unknown | — | 42.9° 16:55 | 6.9 | 96% | 137.9° |
| 2027-04-23 Fri | 0 | — | unknown | — | 42.9° 16:50 | 6.84 | 90% | 144.1° |
| 2027-04-24 Sat | 0 | — | unknown | — | 42.9° 16:50 | 6.78 | 84% | 147.1° |
| 2027-04-25 Sun | 0 | — | unknown | — | 42.9° 16:45 | 6.73 | 76% | 146.2° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2027-03-27&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.