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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 Great Orion Nebula: 03-14 (37), 03-15 (31), 03-16 (24), 03-17 (18), 03-28 (17) — by astronomy; check the weather when the night is within four days.
2032-03-14astronomy score per night — click a bar for that night2032-04-12
night ofastronomyweatheroverall best windowhighestdark hMoonMoon sep.
2032-03-14 Sun 37 — unknown 20:00–21:40 (good, 1.67 h) 42.9° 18:25 9.0 14% 51.5°
2032-03-15 Mon 31 — unknown 20:05–21:30 (good, 1.42 h) 42.9° 18:25 8.95 22% 40.7°
2032-03-16 Tue 24 — unknown 20:05–21:15 (good, 1.17 h) 42.9° 18:20 8.9 31% 31.8°
2032-03-17 Wed 18 — unknown 19:35–22:05 (marginal, 2.5 h) 42.9° 18:15 8.85 41% 26.1°
2032-03-18 Thu 14 — unknown 20:05–21:55 (marginal, 1.83 h) 42.9° 18:10 8.8 51% 25.5°
2032-03-19 Fri 10 — unknown 20:10–21:40 (marginal, 1.5 h) 42.9° 18:05 8.75 60% 30.0°
2032-03-20 Sat 8 — unknown 20:10–21:25 (marginal, 1.25 h) 42.9° 18:05 8.69 69% 37.5°
2032-03-21 Sun 7 — unknown 20:10–21:20 (marginal, 1.17 h) 42.9° 18:00 8.64 78% 46.6°
2032-03-22 Mon 8 — unknown 20:10–21:20 (marginal, 1.17 h) 42.9° 17:55 8.59 85% 56.5°
2032-03-23 Tue 8 — unknown 20:15–21:20 (marginal, 1.08 h) 42.9° 17:50 8.54 91% 66.9°
2032-03-24 Wed 10 — unknown 20:15–21:25 (marginal, 1.17 h) 42.9° 17:45 8.48 96% 77.6°
2032-03-25 Thu 12 — unknown 20:15–21:30 (marginal, 1.25 h) 42.9° 17:45 8.43 99% 88.6°
2032-03-26 Fri 14 — unknown 20:15–20:30 (good, 0.25 h) 42.9° 17:40 8.38 100% 99.7°
2032-03-27 Sat 15 — unknown 20:20–20:40 (good, 0.33 h) 42.9° 17:35 8.32 99% 110.9°
2032-03-28 Sun 17 — unknown 21:20–21:40 (good, 0.33 h) 42.9° 18:30 8.27 96% 122.1°
2032-03-29 Mon 16 — unknown 21:20–21:45 (good, 0.42 h) 42.9° 18:30 8.22 92% 133.0°
2032-03-30 Tue 13 — unknown 21:25–21:45 (good, 0.33 h) 42.9° 18:25 8.16 85% 143.1°
2032-03-31 Wed 12 — unknown 21:25–21:40 (good, 0.25 h) 42.9° 18:20 8.11 76% 151.2°
2032-04-01 Thu 10 — unknown 21:25–21:35 (good, 0.17 h) 42.9° 18:15 8.05 66% 154.9°
2032-04-02 Fri 9 — unknown 21:25–21:30 (good, 0.08 h) 42.9° 18:10 8.0 56% 152.2°
2032-04-03 Sat 7 — unknown 21:30–22:00 (marginal, 0.5 h) 42.9° 18:10 7.94 44% 144.1°
2032-04-04 Sun 6 — unknown 21:30–21:55 (marginal, 0.42 h) 42.9° 18:05 7.89 33% 133.3°
2032-04-05 Mon 5 — unknown 21:30–21:50 (marginal, 0.33 h) 42.9° 18:00 7.83 23% 121.2°
2032-04-06 Tue 4 — unknown 21:30–21:45 (marginal, 0.25 h) 42.9° 17:55 7.77 14% 108.3°
2032-04-07 Wed 3 — unknown 21:00–21:10 (marginal, 0.17 h) 42.9° 17:50 7.72 6% 95.1°
2032-04-08 Thu 3 — unknown 21:35–21:40 (marginal, 0.08 h) 42.9° 17:50 7.66 2% 82.0°
2032-04-09 Fri 2 — unknown 21:00–21:05 (marginal, 0.08 h) 42.9° 17:45 7.61 0% 69.0°
2032-04-10 Sat 1 — unknown — 42.9° 17:40 7.55 1% 56.6°
2032-04-11 Sun 1 — unknown — 42.9° 17:35 7.49 4% 45.0°
2032-04-12 Mon 1 — unknown — 42.9° 17:35 7.43 10% 35.0°

Download: CSV · JSON


💡 API
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-03-14&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.