← 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. |
|---|---|---|---|---|---|---|---|---|
| 2027-05-09 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° |
| 2027-05-18 Tue | 6 | — | unknown | 03:40–04:05 (marginal, 0.42 h) | 89.6° 10:20 | 5.43 | 97% | 149.6° |
| 2027-05-19 Wed | 5 | — | unknown | 04:20–04:45 (marginal, 0.42 h) | 89.7° 10:15 | 5.38 | 100% | 143.5° |
| 2027-05-20 Thu | 6 | — | unknown | 03:35–04:00 (marginal, 0.42 h) | 89.7° 10:10 | 5.33 | 100% | 135.0° |
| 2027-05-21 Fri | 7 | — | unknown | 03:30–04:00 (marginal, 0.5 h) | 89.6° 10:05 | 5.28 | 98% | 125.4° |
| 2027-05-22 Sat | 7 | — | unknown | 03:25–03:55 (marginal, 0.5 h) | 89.5° 10:05 | 5.23 | 94% | 115.2° |
| 2027-05-23 Sun | 7 | — | unknown | 03:20–03:55 (marginal, 0.58 h) | 89.6° 10:00 | 5.19 | 89% | 104.9° |
| 2027-05-24 Mon | 7 | — | unknown | 03:20–03:55 (marginal, 0.58 h) | 89.7° 09:55 | 5.14 | 82% | 94.4° |
| 2027-05-25 Tue | 7 | — | unknown | 03:15–03:55 (marginal, 0.67 h) | 89.7° 09:50 | 5.09 | 74% | 84.0° |
| 2027-05-26 Wed | 7 | — | unknown | 03:10–03:50 (marginal, 0.67 h) | 89.6° 09:45 | 5.05 | 66% | 73.7° |
| 2027-05-27 Thu | 8 | — | unknown | 03:05–03:50 (marginal, 0.75 h) | 89.5° 09:45 | 5.0 | 56% | 63.4° |
| 2027-05-28 Fri | 10 | — | unknown | 03:00–03:50 (marginal, 0.83 h) | 89.7° 09:40 | 4.96 | 47% | 53.4° |
| 2027-05-29 Sat | 11 | — | unknown | 03:00–04:40 (marginal, 1.67 h) | 89.7° 09:35 | 4.92 | 37% | 44.0° |
| 2027-05-30 Sun | 12 | — | unknown | 03:40–03:45 (good, 0.08 h) | 89.7° 09:30 | 4.88 | 27% | 35.6° |
| 2027-05-31 Mon | 15 | — | unknown | 03:30–03:45 (good, 0.25 h) | 89.5° 09:25 | 4.84 | 19% | 29.8° |
| 2027-06-01 Tue | 18 | — | unknown | 03:20–03:45 (good, 0.42 h) | 89.6° 09:25 | 4.8 | 11% | 28.7° |
| 2027-06-02 Wed | 20 | — | unknown | 03:15–03:45 (good, 0.5 h) | 89.7° 09:20 | 4.77 | 5% | 33.3° |
| 2027-06-03 Thu | 22 | — | unknown | 03:10–03:45 (good, 0.58 h) | 89.7° 09:15 | 4.73 | 1% | 42.0° |
| 2027-06-04 Fri | 23 | — | unknown | 03:10–03:45 (good, 0.58 h) | 89.6° 09:10 | 4.7 | 0% | 53.0° |
| 2027-06-05 Sat | 24 | — | unknown | 03:05–03:40 (good, 0.58 h) | 89.5° 09:10 | 4.67 | 2% | 65.3° |
| 2027-06-06 Sun | 25 | — | unknown | 03:00–03:40 (good, 0.67 h) | 89.6° 09:05 | 4.64 | 6% | 78.2° |
| 2027-06-07 Mon | 25 | — | unknown | 02:55–03:40 (good, 0.75 h) | 89.7° 09:00 | 4.61 | 14% | 91.2° |
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2027-05-09&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.