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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 North America Nebula: 07-21 (100), 07-22 (100), 07-23 (100), 07-24 (100), 07-25 (100) — by astronomy; check the weather when the night is within four days.
2045-07-21astronomy score per night — click a bar for that night2045-08-19
night ofastronomyweatheroverall best windowhighestdark hMoonMoon sep.
2045-07-21 Fri 100 — unknown 22:50–04:10 (good, 5.33 h) 87.2° 02:20 5.29 59% 109.7°
2045-07-22 Sat 100 — unknown 22:50–04:10 (good, 5.33 h) 87.2° 02:15 5.34 69% 103.2°
2045-07-23 Sun 100 — unknown 22:50–04:10 (good, 5.33 h) 87.2° 02:15 5.39 78% 96.3°
2045-07-24 Mon 100 — unknown 22:45–04:15 (good, 5.5 h) 87.2° 02:10 5.44 86% 89.3°
2045-07-25 Tue 100 — unknown 22:45–04:15 (good, 5.5 h) 87.2° 02:05 5.49 92% 82.5°
2045-07-26 Wed 77 — unknown 22:45–04:15 (good, 5.5 h) 87.2° 02:00 5.55 96% 75.9°
2045-07-27 Thu 71 — unknown 22:40–04:20 (good, 5.67 h) 87.2° 01:55 5.6 99% 69.9°
2045-07-28 Fri 64 — unknown 22:40–00:50 (good, 2.17 h) 87.2° 01:55 5.65 100% 64.7°
2045-07-29 Sat 60 — unknown 22:40–23:50 (good, 1.17 h) 87.2° 01:50 5.71 99% 60.4°
2045-07-30 Sun 61 — unknown 22:35–23:50 (good, 1.25 h) 87.2° 01:45 5.76 96% 57.3°
2045-07-31 Mon 65 — unknown 22:35–00:15 (good, 1.67 h) 87.2° 01:40 5.81 92% 55.8°
2045-08-01 Tue 70 — unknown 22:35–01:10 (good, 2.58 h) 87.2° 01:40 5.87 86% 55.9°
2045-08-02 Wed 98 — unknown 22:30–02:40 (good, 4.17 h) 87.2° 01:35 5.93 79% 57.7°
2045-08-03 Thu 100 — unknown 22:30–04:30 (good, 6.0 h) 87.2° 01:30 5.98 70% 61.1°
2045-08-04 Fri 100 — unknown 22:30–04:30 (good, 6.0 h) 87.2° 01:25 6.04 61% 65.8°
2045-08-05 Sat 100 — unknown 22:25–04:35 (good, 6.17 h) 87.2° 01:20 6.09 51% 71.7°
2045-08-06 Sun 100 — unknown 22:25–04:35 (good, 6.17 h) 87.2° 01:20 6.15 40% 78.5°
2045-08-07 Mon 100 — unknown 22:25–04:35 (good, 6.17 h) 87.2° 01:15 6.21 30% 86.0°
2045-08-08 Tue 100 — unknown 22:20–04:35 (good, 6.25 h) 87.2° 01:10 6.26 20% 93.8°
2045-08-09 Wed 100 — unknown 22:20–04:40 (good, 6.33 h) 87.2° 01:05 6.32 11% 101.8°
2045-08-10 Thu 100 — unknown 22:20–04:40 (good, 6.33 h) 87.2° 01:00 6.38 5% 109.4°
2045-08-11 Fri 100 — unknown 22:15–04:40 (good, 6.42 h) 87.2° 01:00 6.44 1% 116.1°
2045-08-12 Sat 100 — unknown 22:15–04:45 (good, 6.5 h) 87.2° 00:55 6.49 0% 121.1°
2045-08-13 Sun 100 — unknown 22:10–04:45 (good, 6.58 h) 87.2° 00:50 6.55 2% 123.9°
2045-08-14 Mon 100 — unknown 22:10–04:45 (good, 6.58 h) 87.2° 00:45 6.61 7% 124.1°
2045-08-15 Tue 100 — unknown 22:10–04:50 (good, 6.67 h) 87.2° 00:45 6.67 14% 121.7°
2045-08-16 Wed 100 — unknown 22:05–04:50 (good, 6.75 h) 87.2° 00:40 6.72 24% 117.3°
2045-08-17 Thu 100 — unknown 22:05–04:50 (good, 6.75 h) 87.2° 00:35 6.78 34% 111.6°
2045-08-18 Fri 100 — unknown 22:00–04:55 (good, 6.92 h) 87.2° 00:30 6.84 44% 105.1°
2045-08-19 Sat 100 — unknown 22:00–04:55 (good, 6.92 h) 87.2° 00:25 6.9 55% 98.1°

Download: CSV · JSON

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2045-07-21&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.