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Rozhen Observation Calendar

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.

Best nights for 3C 273: 11-17 (13), 11-18 (12), 11-14 (11), 11-15 (11), 11-16 (11) — by astronomy; check the weather when the night is within four days.
2032-10-22astronomy score per night — click a bar for that night2032-11-20
night ofastronomyweatheroverall best windowhighestdark hMoonMoon sep.
2032-10-22 Fri 0 — unknown — 50.2° 11:45 10.14 80% 102.8°
2032-10-23 Sat 0 — unknown — 50.2° 11:40 10.18 71% 90.1°
2032-10-24 Sun 0 — unknown — 50.2° 11:35 10.22 62% 77.7°
2032-10-25 Mon 0 — unknown — 50.2° 11:30 10.26 52% 65.6°
2032-10-26 Tue 0 — unknown — 50.2° 11:25 10.3 42% 53.7°
2032-10-27 Wed 0 — unknown — 50.2° 11:25 10.34 33% 42.0°
2032-10-28 Thu 0 — unknown — 50.2° 11:20 10.37 24% 30.4°
2032-10-29 Fri 0 — unknown — 50.2° 11:15 10.41 17% 19.1°
2032-10-30 Sat 0 — unknown — 50.2° 10:10 10.45 10% 9.1°
2032-10-31 Sun 0 — unknown — 50.2° 10:05 10.49 5% 9.3°
2032-11-01 Mon 0 — unknown — 50.2° 10:05 10.52 2% 19.7°
2032-11-02 Tue 1 — unknown — 50.2° 10:00 10.56 0% 31.7°
2032-11-03 Wed 1 — unknown — 50.2° 09:55 10.59 0% 44.2°
2032-11-04 Thu 1 — unknown — 50.2° 09:50 10.63 3% 56.9°
2032-11-05 Fri 1 — unknown — 50.2° 09:45 10.66 8% 70.0°
2032-11-06 Sat 1 — unknown 05:55–06:00 (marginal, 0.08 h) 50.2° 09:45 10.7 14% 83.2°
2032-11-07 Sun 3 — unknown 05:25–05:30 (marginal, 0.08 h) 50.2° 09:40 10.73 23% 96.7°
2032-11-08 Mon 3 — unknown 05:50–06:05 (marginal, 0.25 h) 50.2° 09:35 10.76 33% 110.3°
2032-11-09 Tue 4 — unknown 05:15–05:30 (marginal, 0.25 h) 50.2° 09:30 10.79 44% 124.0°
2032-11-10 Wed 5 — unknown 05:15–05:35 (marginal, 0.33 h) 50.2° 09:30 10.83 55% 137.9°
2032-11-11 Thu 6 — unknown 05:10–06:05 (marginal, 0.92 h) 50.2° 09:25 10.86 66% 151.8°
2032-11-12 Fri 8 — unknown 05:05–06:05 (marginal, 1.0 h) 50.2° 09:20 10.89 77% 165.2°
2032-11-13 Sat 9 — unknown 05:30–05:35 (good, 0.08 h) 50.2° 09:15 10.92 86% 172.9°
2032-11-14 Sun 11 — unknown 05:25–05:35 (good, 0.17 h) 50.2° 09:10 10.95 93% 162.9°
2032-11-15 Mon 11 — unknown 05:30–05:40 (good, 0.17 h) 50.2° 09:10 10.97 98% 149.3°
2032-11-16 Tue 11 — unknown 05:25–05:40 (good, 0.25 h) 50.2° 09:05 11.0 100% 135.4°
2032-11-17 Wed 13 — unknown 05:25–05:40 (good, 0.25 h) 50.2° 09:00 11.03 99% 121.7°
2032-11-18 Thu 12 — unknown 05:30–05:40 (good, 0.17 h) 50.2° 08:55 11.06 97% 108.2°
2032-11-19 Fri 11 — unknown 04:40–05:40 (marginal, 1.0 h) 50.2° 08:50 11.08 92% 95.1°
2032-11-20 Sat 10 — unknown 04:40–05:45 (marginal, 1.08 h) 50.2° 08:50 11.11 85% 82.3°

Download: CSV · JSON


💡 API
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-10-22&days=30"
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&days=30&format=csv" -o m31-calendar.csv

One 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.