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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 HD 189733: 07-03 (100), 07-04 (100), 07-05 (100), 07-06 (100), 07-07 (100) — by astronomy; check the weather when the night is within four days.
2033-07-03astronomy score per night — click a bar for that night2033-08-01
night ofastronomyweatheroverall best windowhighestdark hMoonMoon sep.
2033-07-03 Sun 100 — unknown 23:10–03:45 (good, 4.58 h) 71.1° 02:35 4.59 43% 116.0°
2033-07-04 Mon 100 — unknown 23:10–03:45 (good, 4.58 h) 71.1° 02:30 4.62 52% 107.0°
2033-07-05 Tue 100 — unknown 23:10–03:50 (good, 4.67 h) 71.1° 02:25 4.65 62% 97.7°
2033-07-06 Wed 100 — unknown 23:10–03:50 (good, 4.67 h) 71.1° 02:20 4.68 71% 88.2°
2033-07-07 Thu 100 — unknown 23:05–03:50 (good, 4.75 h) 71.1° 02:20 4.71 79% 78.5°
2033-07-08 Fri 100 — unknown 23:05–03:50 (good, 4.75 h) 71.1° 02:15 4.74 87% 68.8°
2033-07-09 Sat 66 — unknown 00:20–03:50 (good, 3.5 h) 71.1° 02:10 4.78 93% 59.3°
2033-07-10 Sun 51 — unknown 03:20–03:55 (good, 0.58 h) 71.1° 02:05 4.81 97% 50.5°
2033-07-11 Mon 39 — unknown 23:05–03:55 (marginal, 4.83 h) 71.1° 02:05 4.85 100% 43.2°
2033-07-12 Tue 32 — unknown 23:05–03:55 (marginal, 4.83 h) 71.1° 02:00 4.89 99% 38.5°
2033-07-13 Wed 35 — unknown 23:00–03:55 (marginal, 4.92 h) 71.1° 01:55 4.93 97% 37.8°
2033-07-14 Thu 45 — unknown 23:00–04:00 (marginal, 5.0 h) 71.1° 01:50 4.97 92% 41.4°
2033-07-15 Fri 61 — unknown 23:00–01:20 (good, 2.33 h) 71.1° 01:45 5.01 84% 48.6°
2033-07-16 Sat 96 — unknown 23:00–04:00 (good, 5.0 h) 71.1° 01:45 5.06 75% 57.8°
2033-07-17 Sun 100 — unknown 22:55–04:05 (good, 5.17 h) 71.1° 01:40 5.1 64% 68.2°
2033-07-18 Mon 100 — unknown 22:55–04:05 (good, 5.17 h) 71.1° 01:35 5.15 53% 79.2°
2033-07-19 Tue 100 — unknown 22:55–04:05 (good, 5.17 h) 71.1° 01:30 5.19 41% 90.4°
2033-07-20 Wed 100 — unknown 22:55–04:05 (good, 5.17 h) 71.1° 01:25 5.24 31% 101.4°
2033-07-21 Thu 100 — unknown 22:50–04:10 (good, 5.33 h) 71.1° 01:25 5.29 21% 112.0°
2033-07-22 Fri 100 — unknown 22:50–04:10 (good, 5.33 h) 71.1° 01:20 5.34 13% 121.9°
2033-07-23 Sat 100 — unknown 22:50–04:10 (good, 5.33 h) 71.1° 01:15 5.39 6% 130.6°
2033-07-24 Sun 100 — unknown 22:45–04:15 (good, 5.5 h) 71.1° 01:10 5.44 2% 137.5°
2033-07-25 Mon 100 — unknown 22:45–04:15 (good, 5.5 h) 71.1° 01:10 5.49 0% 141.6°
2033-07-26 Tue 100 — unknown 22:45–04:15 (good, 5.5 h) 71.1° 01:05 5.54 0% 142.3°
2033-07-27 Wed 100 — unknown 22:40–04:20 (good, 5.67 h) 71.1° 01:00 5.59 3% 139.5°
2033-07-28 Thu 100 — unknown 22:40–04:20 (good, 5.67 h) 71.1° 00:55 5.65 7% 134.0°
2033-07-29 Fri 100 — unknown 22:40–04:20 (good, 5.67 h) 71.1° 00:50 5.7 12% 126.8°
2033-07-30 Sat 100 — unknown 22:40–04:25 (good, 5.75 h) 71.1° 00:50 5.76 19% 118.6°
2033-07-31 Sun 100 — unknown 22:35–04:25 (good, 5.83 h) 71.1° 00:45 5.81 27% 109.8°
2033-08-01 Mon 100 — unknown 22:35–04:25 (good, 5.83 h) 71.1° 00:40 5.86 36% 100.6°

Download: CSV · JSON

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-07-03&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.