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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: 10-11 (100), 10-12 (100), 10-13 (100), 10-14 (100), 10-15 (100) — by astronomy; check the weather when the night is within four days.
2047-10-01astronomy score per night — click a bar for that night2047-10-30
night ofastronomyweatheroverall best windowhighestdark hMoonMoon sep.
2047-10-01 Tue 92 — unknown 04:15–05:50 (good, 1.58 h) 79.2° 02:15 9.18 96% 49.0°
2047-10-02 Wed 49 — unknown 20:55–05:50 (marginal, 8.92 h) 79.2° 02:10 9.22 99% 37.6°
2047-10-03 Thu 32 — unknown 02:50–05:50 (marginal, 3.0 h) 79.2° 02:05 9.27 100% 26.9°
2047-10-04 Fri 27 — unknown 20:40–23:30 (marginal, 2.83 h) 79.2° 02:05 9.32 99% 18.1°
2047-10-05 Sat 31 — unknown 20:30–00:30 (marginal, 4.0 h) 79.2° 02:00 9.37 96% 14.8°
2047-10-06 Sun 39 — unknown 20:30–02:00 (marginal, 5.5 h) 79.2° 01:55 9.41 92% 19.6°
2047-10-07 Mon 50 — unknown 20:30–05:55 (marginal, 9.42 h) 79.2° 01:50 9.46 86% 28.7°
2047-10-08 Tue 82 — unknown 20:25–21:05 (good, 0.67 h) 79.2° 01:50 9.5 79% 39.2°
2047-10-09 Wed 88 — unknown 20:25–02:15 (good, 5.83 h) 79.2° 01:45 9.55 71% 50.3°
2047-10-10 Thu 96 — unknown 20:25–05:15 (good, 8.83 h) 79.2° 01:40 9.6 62% 61.7°
2047-10-11 Fri 100 — unknown 20:20–06:00 (good, 9.67 h) 79.2° 01:35 9.64 53% 73.5°
2047-10-12 Sat 100 — unknown 20:20–06:00 (good, 9.67 h) 79.2° 01:30 9.69 43% 85.6°
2047-10-13 Sun 100 — unknown 20:20–06:00 (good, 9.67 h) 79.2° 01:30 9.73 33% 98.1°
2047-10-14 Mon 100 — unknown 20:15–06:05 (good, 9.83 h) 79.2° 01:25 9.77 23% 111.0°
2047-10-15 Tue 100 — unknown 20:15–06:05 (good, 9.83 h) 79.2° 01:20 9.82 14% 124.2°
2047-10-16 Wed 100 — unknown 20:15–06:05 (good, 9.83 h) 79.2° 01:15 9.86 7% 137.7°
2047-10-17 Thu 100 — unknown 20:10–06:05 (good, 9.92 h) 79.2° 01:10 9.9 2% 150.8°
2047-10-18 Fri 100 — unknown 20:10–06:05 (good, 9.92 h) 79.2° 01:10 9.95 0% 162.0°
2047-10-19 Sat 100 — unknown 20:10–06:10 (good, 10.0 h) 79.2° 01:05 9.99 1% 164.5°
2047-10-20 Sun 100 — unknown 20:10–06:10 (good, 10.0 h) 79.2° 01:00 10.03 5% 155.4°
2047-10-21 Mon 100 — unknown 20:05–06:10 (good, 10.08 h) 79.2° 00:55 10.07 11% 142.5°
2047-10-22 Tue 100 — unknown 20:05–06:10 (good, 10.08 h) 79.2° 00:55 10.11 20% 128.8°
2047-10-23 Wed 100 — unknown 20:05–06:15 (good, 10.17 h) 79.2° 00:50 10.15 30% 115.1°
2047-10-24 Thu 100 — unknown 20:00–06:15 (good, 10.25 h) 79.2° 00:45 10.19 40% 101.7°
2047-10-25 Fri 100 — unknown 20:00–06:15 (good, 10.25 h) 79.2° 00:40 10.23 51% 88.7°
2047-10-26 Sat 100 — unknown 20:00–05:10 (good, 10.17 h) 79.2° 00:35 10.27 62% 76.0°
2047-10-27 Sun 100 — unknown 19:45–05:05 (good, 9.33 h) 79.2° 23:35 10.31 71% 63.7°
2047-10-28 Mon 94 — unknown 23:05–05:00 (good, 5.92 h) 79.2° 23:30 10.35 80% 51.8°
2047-10-29 Tue 86 — unknown 03:35–05:00 (good, 1.42 h) 79.2° 23:25 10.39 87% 40.3°
2047-10-30 Wed 71 — unknown 04:35–04:55 (good, 0.33 h) 79.2° 23:20 10.42 93% 29.5°

Download: CSV · JSON

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2047-10-01&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.