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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: 02-12 (93), 02-13 (93), 02-14 (93), 02-15 (93), 02-16 (93) — by astronomy; check the weather when the night is within four days.
2034-02-10astronomy score per night — click a bar for that night2034-03-11
night ofastronomyweatheroverall best windowhighestdark hMoonMoon sep.
2034-02-10 Fri 85 — unknown 23:40–05:45 (good, 6.08 h) 50.2° 03:25 10.44 55% 40.6°
2034-02-11 Sat 90 — unknown 23:35–05:50 (good, 6.25 h) 50.2° 03:25 10.4 46% 52.4°
2034-02-12 Sun 93 — unknown 23:30–05:50 (good, 6.33 h) 50.2° 03:20 10.36 36% 64.4°
2034-02-13 Mon 93 — unknown 23:30–05:45 (good, 6.25 h) 50.2° 03:15 10.32 27% 76.7°
2034-02-14 Tue 93 — unknown 23:25–05:45 (good, 6.33 h) 50.2° 03:10 10.28 18% 89.3°
2034-02-15 Wed 93 — unknown 23:20–05:45 (good, 6.42 h) 50.2° 03:05 10.24 11% 102.3°
2034-02-16 Thu 93 — unknown 23:15–05:45 (good, 6.5 h) 50.2° 03:05 10.2 5% 115.6°
2034-02-17 Fri 93 — unknown 23:15–05:40 (good, 6.42 h) 50.2° 03:00 10.16 2% 129.3°
2034-02-18 Sat 93 — unknown 23:10–05:40 (good, 6.5 h) 50.2° 02:55 10.12 0% 143.4°
2034-02-19 Sun 93 — unknown 23:05–05:40 (good, 6.58 h) 50.2° 02:50 10.08 1% 157.6°
2034-02-20 Mon 93 — unknown 23:00–05:40 (good, 6.67 h) 50.2° 02:50 10.04 5% 171.3°
2034-02-21 Tue 93 — unknown 22:55–05:35 (good, 6.67 h) 50.2° 02:45 10.0 12% 171.5°
2034-02-22 Wed 93 — unknown 22:55–05:35 (good, 6.67 h) 50.2° 02:40 9.95 20% 157.8°
2034-02-23 Thu 93 — unknown 22:50–05:35 (good, 6.75 h) 50.2° 02:35 9.91 30% 143.6°
2034-02-24 Fri 93 — unknown 22:50–05:30 (good, 6.67 h) 50.2° 02:30 9.87 42% 129.5°
2034-02-25 Sat 93 — unknown 22:50–05:30 (good, 6.67 h) 50.2° 02:30 9.82 53% 115.5°
2034-02-26 Sun 93 — unknown 22:55–05:30 (good, 6.58 h) 50.2° 02:25 9.78 64% 101.8°
2034-02-27 Mon 91 — unknown 23:00–05:30 (good, 6.5 h) 50.2° 02:20 9.73 74% 88.3°
2034-02-28 Tue 88 — unknown 00:35–05:25 (good, 4.83 h) 50.2° 02:15 9.69 83% 75.0°
2034-03-01 Wed 83 — unknown 03:05–05:25 (good, 2.33 h) 50.2° 02:10 9.64 90% 61.9°
2034-03-02 Thu 45 — unknown 22:40–05:25 (marginal, 6.75 h) 50.2° 02:10 9.6 95% 49.1°
2034-03-03 Fri 30 — unknown 00:50–05:20 (marginal, 4.5 h) 50.2° 02:05 9.55 99% 36.5°
2034-03-04 Sat 22 — unknown 02:25–05:20 (marginal, 2.92 h) 50.2° 02:00 9.51 100% 24.1°
2034-03-05 Sun 22 — unknown 02:30–05:20 (marginal, 2.83 h) 50.2° 01:55 9.46 99% 12.2°
2034-03-06 Mon 23 — unknown 22:15–05:15 (marginal, 7.0 h) 50.2° 01:55 9.41 97% 4.6°
2034-03-07 Tue 30 — unknown 21:55–05:15 (marginal, 7.33 h) 50.2° 01:50 9.36 93% 13.6°
2034-03-08 Wed 45 — unknown 21:30–05:15 (marginal, 7.75 h) 50.2° 01:45 9.32 87% 25.1°
2034-03-09 Thu 82 — unknown 21:55–22:45 (good, 0.83 h) 50.2° 01:40 9.27 80% 36.8°
2034-03-10 Fri 88 — unknown 21:50–02:45 (good, 4.92 h) 50.2° 01:35 9.22 72% 48.6°
2034-03-11 Sat 92 — unknown 21:45–04:35 (good, 6.83 h) 50.2° 01:35 9.17 63% 60.4°

Download: CSV · JSON

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2034-02-10&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.