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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: 07-31 (97), 07-30 (95), 07-29 (92), 07-28 (91), 07-27 (89) — by astronomy; check the weather when the night is within four days.
2033-07-02astronomy score per night — click a bar for that night2033-07-31
night ofastronomyweatheroverall best windowhighestdark hMoonMoon sep.
2033-07-02 Sat 31 — unknown 02:45–03:45 (good, 1.0 h) 79.1° 08:10 4.57 33% 136.1°
2033-07-03 Sun 33 — unknown 02:40–03:45 (good, 1.08 h) 79.1° 08:05 4.59 43% 145.9°
2033-07-04 Mon 35 — unknown 02:35–03:45 (good, 1.17 h) 79.1° 08:05 4.62 52% 154.1°
2033-07-05 Tue 37 — unknown 02:30–03:50 (good, 1.33 h) 79.1° 08:00 4.65 62% 159.0°
2033-07-06 Wed 39 — unknown 02:30–03:50 (good, 1.33 h) 79.1° 07:55 4.68 71% 157.8°
2033-07-07 Thu 40 — unknown 02:30–03:50 (good, 1.33 h) 79.1° 07:50 4.71 79% 151.3°
2033-07-08 Fri 40 — unknown 02:25–03:50 (good, 1.42 h) 79.1° 07:45 4.74 87% 141.7°
2033-07-09 Sat 37 — unknown 02:25–03:50 (good, 1.42 h) 79.1° 07:45 4.78 93% 130.7°
2033-07-10 Sun 38 — unknown 02:25–03:55 (good, 1.5 h) 79.1° 07:40 4.81 97% 118.8°
2033-07-11 Mon 33 — unknown 02:25–03:55 (good, 1.5 h) 79.1° 07:35 4.85 100% 106.3°
2033-07-12 Tue 28 — unknown 02:45–03:55 (good, 1.17 h) 79.1° 07:30 4.89 99% 93.4°
2033-07-13 Wed 23 — unknown 03:50–03:55 (good, 0.08 h) 79.1° 07:25 4.93 97% 80.2°
2033-07-14 Thu 20 — unknown 01:40–04:00 (marginal, 2.33 h) 79.1° 07:25 4.97 92% 67.0°
2033-07-15 Fri 18 — unknown 01:35–04:00 (marginal, 2.42 h) 79.1° 07:20 5.01 84% 53.9°
2033-07-16 Sat 19 — unknown 01:30–04:00 (marginal, 2.5 h) 79.1° 07:15 5.06 75% 41.3°
2033-07-17 Sun 22 — unknown 01:20–04:05 (marginal, 2.75 h) 79.1° 07:10 5.1 64% 30.0°
2033-07-18 Mon 30 — unknown 02:55–04:05 (good, 1.17 h) 79.1° 07:10 5.15 53% 22.2°
2033-07-19 Tue 39 — unknown 01:55–04:05 (good, 2.17 h) 79.1° 07:05 5.19 41% 21.7°
2033-07-20 Wed 50 — unknown 01:35–04:05 (good, 2.5 h) 79.1° 07:00 5.24 31% 28.6°
2033-07-21 Thu 62 — unknown 01:30–04:10 (good, 2.67 h) 79.1° 06:55 5.29 21% 39.1°
2033-07-22 Fri 70 — unknown 01:25–04:10 (good, 2.75 h) 79.1° 06:50 5.34 13% 50.8°
2033-07-23 Sat 77 — unknown 01:20–04:10 (good, 2.83 h) 79.1° 06:50 5.39 6% 62.9°
2033-07-24 Sun 80 — unknown 01:15–04:15 (good, 3.0 h) 79.1° 06:45 5.44 2% 75.1°
2033-07-25 Mon 82 — unknown 01:15–04:15 (good, 3.0 h) 79.1° 06:40 5.49 0% 87.1°
2033-07-26 Tue 84 — unknown 01:10–04:15 (good, 3.08 h) 79.1° 06:35 5.54 0% 99.0°
2033-07-27 Wed 89 — unknown 01:05–04:20 (good, 3.25 h) 79.1° 06:30 5.59 3% 110.6°
2033-07-28 Thu 91 — unknown 01:00–04:20 (good, 3.33 h) 79.1° 06:30 5.65 7% 121.9°
2033-07-29 Fri 92 — unknown 00:55–04:20 (good, 3.42 h) 79.1° 06:25 5.7 12% 132.7°
2033-07-30 Sat 95 — unknown 00:55–04:25 (good, 3.5 h) 79.1° 06:20 5.76 19% 142.8°
2033-07-31 Sun 97 — unknown 00:50–04:25 (good, 3.58 h) 79.1° 06:15 5.81 27% 151.6°

Download: CSV · JSON


💡 API
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-07-02&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.