← 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 | 0 | — | unknown | — | 79.1° 11:45 | 5.92 | 16% | 62.9° |
| 2027-05-10 Mon | 0 | — | unknown | — | 79.1° 11:40 | 5.86 | 25% | 76.8° |
| 2027-05-11 Tue | 0 | — | unknown | — | 79.1° 11:35 | 5.81 | 36% | 90.7° |
| 2027-05-12 Wed | 0 | — | unknown | — | 79.1° 11:35 | 5.75 | 47% | 104.4° |
| 2027-05-13 Thu | 0 | — | unknown | — | 79.1° 11:30 | 5.7 | 58% | 117.9° |
| 2027-05-14 Fri | 0 | — | unknown | — | 79.1° 11:25 | 5.64 | 69% | 131.1° |
| 2027-05-15 Sat | 0 | — | unknown | — | 79.1° 11:20 | 5.59 | 79% | 143.7° |
| 2027-05-16 Sun | 0 | — | unknown | — | 79.1° 11:15 | 5.54 | 87% | 155.4° |
| 2027-05-17 Mon | 0 | — | unknown | — | 79.1° 11:15 | 5.48 | 93% | 164.0° |
| 2027-05-18 Tue | 0 | — | unknown | — | 79.1° 11:10 | 5.43 | 97% | 164.3° |
| 2027-05-19 Wed | 0 | — | unknown | — | 79.1° 11:05 | 5.38 | 100% | 156.3° |
| 2027-05-20 Thu | 0 | — | unknown | — | 79.1° 11:00 | 5.33 | 100% | 145.6° |
| 2027-05-21 Fri | 0 | — | unknown | — | 79.1° 11:00 | 5.28 | 98% | 134.2° |
| 2027-05-22 Sat | 0 | — | unknown | — | 79.1° 10:55 | 5.23 | 94% | 122.7° |
| 2027-05-23 Sun | 0 | — | unknown | — | 79.1° 10:50 | 5.19 | 89% | 111.1° |
| 2027-05-24 Mon | 0 | — | unknown | — | 79.1° 10:45 | 5.14 | 82% | 99.6° |
| 2027-05-25 Tue | 0 | — | unknown | — | 79.1° 10:40 | 5.09 | 74% | 88.1° |
| 2027-05-26 Wed | 0 | — | unknown | — | 79.1° 10:40 | 5.05 | 66% | 76.6° |
| 2027-05-27 Thu | 0 | — | unknown | — | 79.1° 10:35 | 5.0 | 56% | 65.1° |
| 2027-05-28 Fri | 0 | — | unknown | — | 79.1° 10:30 | 4.96 | 47% | 53.6° |
| 2027-05-29 Sat | 0 | — | unknown | — | 79.1° 10:25 | 4.92 | 37% | 42.0° |
| 2027-05-30 Sun | 0 | — | unknown | — | 79.1° 10:20 | 4.88 | 27% | 30.5° |
| 2027-05-31 Mon | 1 | — | unknown | — | 79.1° 10:20 | 4.84 | 19% | 20.1° |
| 2027-06-01 Tue | 1 | — | unknown | — | 79.1° 10:15 | 4.8 | 11% | 14.4° |
| 2027-06-02 Wed | 1 | — | unknown | — | 79.1° 10:10 | 4.77 | 5% | 19.4° |
| 2027-06-03 Thu | 1 | — | unknown | — | 79.1° 10:05 | 4.73 | 1% | 30.7° |
| 2027-06-04 Fri | 1 | — | unknown | — | 79.1° 10:00 | 4.7 | 0% | 43.9° |
| 2027-06-05 Sat | 2 | — | unknown | 04:30–04:35 (marginal, 0.08 h) | 79.1° 10:00 | 4.67 | 2% | 58.0° |
| 2027-06-06 Sun | 2 | — | unknown | 04:25–04:35 (marginal, 0.17 h) | 79.1° 09:55 | 4.64 | 6% | 72.3° |
| 2027-06-07 Mon | 2 | — | unknown | 04:25–04:30 (marginal, 0.08 h) | 79.1° 09:50 | 4.61 | 14% | 86.6° |
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.