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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 North America Nebula: 10-02 (100), 10-03 (100), 10-04 (100), 10-05 (100), 10-06 (100) — by astronomy; check the weather when the night is within four days.
2032-10-02astronomy score per night — click a bar for that night2032-10-31
night ofastronomyweatheroverall best windowhighestdark hMoonMoon sep.
2032-10-02 Sat 100 — unknown 20:35–03:55 (good, 7.33 h) 87.2° 21:35 9.25 2% 124.8°
2032-10-03 Sun 100 — unknown 20:35–03:50 (good, 7.25 h) 87.2° 21:30 9.3 0% 121.5°
2032-10-04 Mon 100 — unknown 20:30–03:45 (good, 7.25 h) 87.2° 21:25 9.35 0% 116.7°
2032-10-05 Tue 100 — unknown 20:30–03:40 (good, 7.17 h) 87.2° 21:20 9.39 2% 110.8°
2032-10-06 Wed 100 — unknown 20:30–03:35 (good, 7.08 h) 87.2° 21:15 9.44 5% 104.1°
2032-10-07 Thu 100 — unknown 20:25–03:35 (good, 7.17 h) 87.2° 21:15 9.49 11% 96.8°
2032-10-08 Fri 100 — unknown 20:25–03:30 (good, 7.08 h) 87.2° 21:10 9.53 18% 89.2°
2032-10-09 Sat 100 — unknown 20:25–03:25 (good, 7.0 h) 87.2° 21:05 9.58 27% 81.4°
2032-10-10 Sun 100 — unknown 20:20–03:20 (good, 7.0 h) 87.2° 21:00 9.62 37% 73.8°
2032-10-11 Mon 99 — unknown 20:20–03:20 (good, 7.0 h) 87.2° 20:55 9.67 47% 66.7°
2032-10-12 Tue 91 — unknown 20:20–03:15 (good, 6.92 h) 87.2° 20:55 9.71 59% 60.6°
2032-10-13 Wed 82 — unknown 20:15–03:10 (good, 6.92 h) 87.2° 20:50 9.76 70% 56.0°
2032-10-14 Thu 61 — unknown 23:10–00:00 (good, 0.83 h) 87.2° 20:45 9.8 80% 53.5°
2032-10-15 Fri 55 — unknown 20:15–03:30 (marginal, 7.25 h) 87.2° 20:40 9.84 88% 53.7°
2032-10-16 Sat 50 — unknown 20:15–03:10 (marginal, 6.92 h) 87.2° 20:40 9.89 95% 56.7°
2032-10-17 Sun 54 — unknown 20:10–03:00 (marginal, 6.83 h) 87.2° 20:35 9.93 99% 61.9°
2032-10-18 Mon 63 — unknown 20:10–21:25 (good, 1.25 h) 87.2° 20:30 9.97 100% 68.8°
2032-10-19 Tue 73 — unknown 20:10–23:25 (good, 3.25 h) 87.2° 20:25 10.01 98% 76.7°
2032-10-20 Wed 80 — unknown 20:05–00:30 (good, 4.42 h) 87.2° 20:20 10.06 94% 84.9°
2032-10-21 Thu 100 — unknown 20:05–01:40 (good, 5.58 h) 87.2° 20:20 10.1 88% 93.2°
2032-10-22 Fri 100 — unknown 20:05–02:10 (good, 6.08 h) 87.2° 20:15 10.14 80% 101.0°
2032-10-23 Sat 100 — unknown 20:05–02:15 (good, 6.17 h) 87.2° 20:10 10.18 71% 108.2°
2032-10-24 Sun 100 — unknown 20:00–02:15 (good, 6.25 h) 87.2° 20:05 10.22 62% 114.5°
2032-10-25 Mon 100 — unknown 20:00–02:15 (good, 6.25 h) 87.2° 20:00 10.26 52% 119.8°
2032-10-26 Tue 100 — unknown 20:00–02:15 (good, 6.25 h) 87.2° 20:00 10.3 42% 123.7°
2032-10-27 Wed 100 — unknown 20:00–02:15 (good, 6.25 h) 87.2° 19:55 10.34 33% 126.1°
2032-10-28 Thu 100 — unknown 19:55–02:10 (good, 6.25 h) 87.2° 19:50 10.37 24% 126.7°
2032-10-29 Fri 100 — unknown 19:55–02:05 (good, 6.17 h) 87.2° 19:45 10.41 17% 125.6°
2032-10-30 Sat 100 — unknown 19:55–02:05 (good, 6.17 h) 87.2° 19:45 10.45 10% 122.7°
2032-10-31 Sun 100 — unknown 18:55–01:00 (good, 6.08 h) 87.2° 18:40 10.49 5% 118.3°

Download: CSV · JSON

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-10-02&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.