← 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. |
|---|---|---|---|---|---|---|---|---|
| 2027-04-18 Sun | 0 | — | unknown | — | 89.7° 12:20 | 7.13 | 95% | 142.5° |
| 2027-04-19 Mon | 0 | — | unknown | — | 89.6° 12:15 | 7.08 | 99% | 149.3° |
| 2027-04-20 Tue | 0 | — | unknown | — | 89.5° 12:10 | 7.02 | 100% | 151.3° |
| 2027-04-21 Wed | 0 | — | unknown | — | 89.6° 12:10 | 6.96 | 99% | 148.0° |
| 2027-04-22 Thu | 0 | — | unknown | — | 89.7° 12:05 | 6.9 | 96% | 141.0° |
| 2027-04-23 Fri | 0 | — | unknown | — | 89.7° 12:00 | 6.84 | 90% | 132.0° |
| 2027-04-24 Sat | 0 | — | unknown | — | 89.5° 11:55 | 6.78 | 84% | 122.2° |
| 2027-04-25 Sun | 0 | — | unknown | — | 89.6° 11:50 | 6.73 | 76% | 112.0° |
| 2027-04-26 Mon | 0 | — | unknown | — | 89.7° 11:45 | 6.67 | 68% | 101.6° |
| 2027-04-27 Tue | 0 | — | unknown | — | 89.7° 11:40 | 6.61 | 59% | 91.2° |
| 2027-04-28 Wed | 1 | — | unknown | — | 89.5° 11:35 | 6.55 | 49% | 80.8° |
| 2027-04-29 Thu | 1 | — | unknown | — | 89.5° 11:35 | 6.49 | 40% | 70.4° |
| 2027-04-30 Fri | 1 | — | unknown | — | 89.7° 11:30 | 6.43 | 31% | 60.2° |
| 2027-05-01 Sat | 1 | — | unknown | — | 89.7° 11:25 | 6.38 | 22% | 50.2° |
| 2027-05-02 Sun | 1 | — | unknown | — | 89.6° 11:20 | 6.32 | 14% | 40.8° |
| 2027-05-03 Mon | 1 | — | unknown | — | 89.5° 11:15 | 6.26 | 8% | 33.1° |
| 2027-05-04 Tue | 1 | — | unknown | — | 89.6° 11:15 | 6.2 | 3% | 28.9° |
| 2027-05-05 Wed | 1 | — | unknown | — | 89.7° 11:10 | 6.15 | 0% | 30.0° |
| 2027-05-06 Thu | 2 | — | unknown | 05:00–05:05 (marginal, 0.08 h) | 89.7° 11:05 | 6.09 | 0% | 36.4° |
| 2027-05-07 Fri | 2 | — | unknown | 05:00–05:05 (marginal, 0.08 h) | 89.6° 11:00 | 6.03 | 3% | 46.1° |
| 2027-05-08 Sat | 2 | — | unknown | 04:55–05:00 (marginal, 0.08 h) | 89.5° 11:00 | 5.98 | 8% | 57.5° |
| 2027-05-09 Sun | 2 | — | unknown | 04:50–05:00 (marginal, 0.17 h) | 89.6° 10:55 | 5.92 | 16% | 69.7° |
| 2027-05-10 Mon | 2 | — | unknown | 04:45–05:00 (marginal, 0.25 h) | 89.7° 10:50 | 5.86 | 25% | 82.3° |
| 2027-05-11 Tue | 3 | — | unknown | 04:40–04:55 (marginal, 0.25 h) | 89.7° 10:45 | 5.81 | 36% | 94.9° |
| 2027-05-12 Wed | 3 | — | unknown | 04:40–04:55 (marginal, 0.25 h) | 89.5° 10:40 | 5.75 | 47% | 107.2° |
| 2027-05-13 Thu | 4 | — | unknown | 04:35–04:55 (marginal, 0.33 h) | 89.5° 10:40 | 5.7 | 58% | 119.2° |
| 2027-05-14 Fri | 5 | — | unknown | 04:30–04:55 (marginal, 0.42 h) | 89.7° 10:35 | 5.64 | 69% | 130.4° |
| 2027-05-15 Sat | 4 | — | unknown | 04:25–04:50 (marginal, 0.42 h) | 89.7° 10:30 | 5.59 | 79% | 140.3° |
| 2027-05-16 Sun | 5 | — | unknown | 04:25–04:50 (marginal, 0.42 h) | 89.6° 10:25 | 5.54 | 87% | 147.9° |
| 2027-05-17 Mon | 5 | — | unknown | 04:20–04:50 (marginal, 0.5 h) | 89.5° 10:20 | 5.48 | 93% | 151.4° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2027-04-18&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.