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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 V1057 Cyg: 10-05 (100), 10-06 (100), 10-07 (100), 10-08 (100), 10-19 (100) — by astronomy; check the weather when the night is within four days.
2035-10-05astronomy score per night — click a bar for that night2035-11-03
night ofastronomyweatheroverall best windowhighestdark hMoonMoon sep.
2035-10-05 Fri 100 — unknown 20:30–03:45 (good, 7.25 h) 87.3° 21:25 9.36 19% 88.4°
2035-10-06 Sat 100 — unknown 20:30–03:40 (good, 7.17 h) 87.3° 21:20 9.41 27% 82.0°
2035-10-07 Sun 100 — unknown 20:30–03:35 (good, 7.08 h) 87.3° 21:15 9.45 36% 75.9°
2035-10-08 Mon 100 — unknown 20:25–03:30 (good, 7.08 h) 87.3° 21:10 9.5 45% 70.4°
2035-10-09 Tue 96 — unknown 20:25–03:30 (good, 7.08 h) 87.3° 21:10 9.55 55% 65.5°
2035-10-10 Wed 90 — unknown 20:25–03:25 (good, 7.0 h) 87.3° 21:05 9.59 64% 61.5°
2035-10-11 Thu 83 — unknown 20:20–03:20 (good, 7.0 h) 87.3° 21:00 9.64 73% 58.8°
2035-10-12 Fri 63 — unknown 20:20–01:20 (good, 5.0 h) 87.3° 20:55 9.68 81% 57.5°
2035-10-13 Sat 60 — unknown 19:45–03:45 (marginal, 8.0 h) 87.3° 20:55 9.73 89% 58.0°
2035-10-14 Sun 60 — unknown 20:15–20:20 (good, 0.08 h) 87.3° 20:50 9.77 94% 60.3°
2035-10-15 Mon 61 — unknown 20:15–20:50 (good, 0.58 h) 87.3° 20:45 9.81 98% 64.2°
2035-10-16 Tue 67 — unknown 20:15–21:50 (good, 1.58 h) 87.3° 20:40 9.86 100% 69.6°
2035-10-17 Wed 73 — unknown 20:10–23:30 (good, 3.33 h) 87.3° 20:35 9.9 99% 76.2°
2035-10-18 Thu 79 — unknown 20:10–00:30 (good, 4.33 h) 87.3° 20:35 9.94 96% 83.5°
2035-10-19 Fri 100 — unknown 20:10–01:30 (good, 5.33 h) 87.3° 20:30 9.98 90% 91.2°
2035-10-20 Sat 100 — unknown 20:10–02:15 (good, 6.08 h) 87.3° 20:25 10.03 82% 98.8°
2035-10-21 Sun 100 — unknown 20:05–02:25 (good, 6.33 h) 87.3° 20:20 10.07 72% 106.0°
2035-10-22 Mon 100 — unknown 20:05–02:25 (good, 6.33 h) 87.3° 20:15 10.11 61% 112.4°
2035-10-23 Tue 100 — unknown 20:05–02:25 (good, 6.33 h) 87.3° 20:15 10.15 50% 117.5°
2035-10-24 Wed 100 — unknown 20:00–02:25 (good, 6.42 h) 87.3° 20:10 10.19 38% 120.9°
2035-10-25 Thu 100 — unknown 20:00–02:25 (good, 6.42 h) 87.3° 20:05 10.23 28% 122.4°
2035-10-26 Fri 100 — unknown 20:00–02:20 (good, 6.33 h) 87.3° 20:00 10.27 19% 121.8°
2035-10-27 Sat 100 — unknown 20:00–02:20 (good, 6.33 h) 87.3° 20:00 10.31 11% 119.2°
2035-10-28 Sun 100 — unknown 18:55–01:15 (good, 6.33 h) 87.3° 18:55 10.35 5% 115.1°
2035-10-29 Mon 100 — unknown 18:55–01:10 (good, 6.25 h) 87.3° 18:50 10.38 2% 109.9°
2035-10-30 Tue 100 — unknown 18:55–01:05 (good, 6.17 h) 87.3° 18:45 10.42 0% 103.8°
2035-10-31 Wed 100 — unknown 18:55–01:00 (good, 6.08 h) 87.3° 18:40 10.46 1% 97.4°
2035-11-01 Thu 100 — unknown 18:50–01:00 (good, 6.17 h) 87.3° 18:40 10.49 3% 90.8°
2035-11-02 Fri 100 — unknown 18:50–00:55 (good, 6.08 h) 87.3° 18:35 10.53 8% 84.3°
2035-11-03 Sat 100 — unknown 18:50–00:50 (good, 6.0 h) 87.3° 18:30 10.57 14% 78.1°

Download: CSV · JSON

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2035-10-05&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.