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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 Triangulum Pinwheel: 02-28 (31), 02-25 (30), 02-29 (30), 02-26 (29), 03-01 (29) — by astronomy; check the weather when the night is within four days.
2032-02-19astronomy score per night — click a bar for that night2032-03-19
night ofastronomyweatheroverall best windowhighestdark hMoonMoon sep.
2032-02-19 Thu 17 — unknown 19:35–21:50 (marginal, 2.25 h) 79.1° 16:00 10.1 67% 52.2°
2032-02-20 Fri 17 — unknown 19:35–21:45 (marginal, 2.17 h) 79.1° 15:55 10.06 76% 63.3°
2032-02-21 Sat 18 — unknown 19:35–21:40 (marginal, 2.08 h) 79.1° 15:55 10.02 84% 74.5°
2032-02-22 Sun 20 — unknown 19:35–19:40 (good, 0.08 h) 79.1° 15:50 9.98 90% 85.7°
2032-02-23 Mon 22 — unknown 19:40–20:30 (good, 0.83 h) 79.1° 15:45 9.93 95% 97.0°
2032-02-24 Tue 26 — unknown 19:40–20:50 (good, 1.17 h) 79.1° 15:40 9.89 98% 108.1°
2032-02-25 Wed 30 — unknown 19:40–20:55 (good, 1.25 h) 79.1° 15:35 9.85 100% 119.3°
2032-02-26 Thu 29 — unknown 19:40–20:55 (good, 1.25 h) 79.1° 15:35 9.8 100% 130.3°
2032-02-27 Fri 28 — unknown 19:45–20:50 (good, 1.08 h) 79.1° 15:30 9.76 98% 141.1°
2032-02-28 Sat 31 — unknown 19:45–20:50 (good, 1.08 h) 79.1° 15:25 9.71 94% 151.1°
2032-02-29 Sun 30 — unknown 19:45–20:55 (good, 1.17 h) 79.1° 15:20 9.67 88% 158.9°
2032-03-01 Mon 29 — unknown 19:45–20:50 (good, 1.08 h) 79.1° 15:15 9.62 81% 161.3°
2032-03-02 Tue 26 — unknown 19:50–20:45 (good, 0.92 h) 79.1° 15:15 9.58 72% 156.1°
2032-03-03 Wed 25 — unknown 19:50–20:40 (good, 0.83 h) 79.1° 15:10 9.53 62% 146.5°
2032-03-04 Thu 23 — unknown 19:50–20:40 (good, 0.83 h) 79.1° 15:05 9.48 52% 135.0°
2032-03-05 Fri 21 — unknown 19:50–20:35 (good, 0.75 h) 79.1° 15:00 9.44 40% 122.4°
2032-03-06 Sat 20 — unknown 19:55–20:30 (good, 0.58 h) 79.1° 14:55 9.39 30% 109.2°
2032-03-07 Sun 18 — unknown 19:55–20:25 (good, 0.5 h) 79.1° 14:55 9.34 20% 95.6°
2032-03-08 Mon 16 — unknown 19:55–20:20 (good, 0.42 h) 79.1° 14:50 9.29 11% 81.6°
2032-03-09 Tue 14 — unknown 19:55–20:20 (good, 0.42 h) 79.1° 14:45 9.25 5% 67.5°
2032-03-10 Wed 13 — unknown 19:55–20:15 (good, 0.33 h) 79.1° 14:40 9.2 1% 53.5°
2032-03-11 Thu 10 — unknown 20:00–20:10 (good, 0.17 h) 79.1° 14:40 9.15 0% 40.1°
2032-03-12 Fri 9 — unknown 20:00–20:05 (good, 0.08 h) 79.1° 14:35 9.1 2% 28.1°
2032-03-13 Sat 7 — unknown 19:30–20:30 (marginal, 1.0 h) 79.1° 14:30 9.05 7% 19.9°
2032-03-14 Sun 6 — unknown 20:00–20:25 (marginal, 0.42 h) 79.1° 14:25 9.0 14% 19.8°
2032-03-15 Mon 4 — unknown 20:05–20:25 (marginal, 0.33 h) 79.1° 14:20 8.95 22% 27.3°
2032-03-16 Tue 3 — unknown 20:05–20:20 (marginal, 0.25 h) 79.1° 14:20 8.9 31% 37.6°
2032-03-17 Wed 2 — unknown 20:05–20:15 (marginal, 0.17 h) 79.1° 14:15 8.85 41% 48.8°
2032-03-18 Thu 1 — unknown 20:05–20:10 (marginal, 0.08 h) 79.1° 14:10 8.8 51% 60.1°
2032-03-19 Fri 1 — unknown — 79.1° 14:05 8.75 60% 71.3°

Download: CSV · JSON


💡 API
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-02-19&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.