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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: 06-01 (52), 06-02 (51), 06-03 (49), 06-04 (48), 06-05 (45) — by astronomy; check the weather when the night is within four days.
2029-06-01astronomy score per night — click a bar for that night2029-06-30
night ofastronomyweatheroverall best windowhighestdark hMoonMoon sep.
2029-06-01 Fri 52 — unknown 23:00–00:55 (good, 1.92 h) 50.2° 21:10 4.79 70% 130.9°
2029-06-02 Sat 51 — unknown 23:00–01:00 (good, 2.0 h) 50.2° 21:05 4.75 61% 143.0°
2029-06-03 Sun 49 — unknown 23:00–00:55 (good, 1.92 h) 50.2° 21:00 4.72 51% 154.5°
2029-06-04 Mon 48 — unknown 23:00–00:50 (good, 1.83 h) 50.2° 21:00 4.68 42% 164.7°
2029-06-05 Tue 45 — unknown 23:05–00:45 (good, 1.67 h) 50.2° 20:55 4.65 32% 170.0°
2029-06-06 Wed 44 — unknown 23:05–00:40 (good, 1.58 h) 50.2° 20:50 4.63 24% 164.3°
2029-06-07 Thu 42 — unknown 23:05–00:40 (good, 1.58 h) 50.2° 20:45 4.6 16% 154.1°
2029-06-08 Fri 40 — unknown 23:05–00:35 (good, 1.5 h) 50.2° 20:40 4.57 10% 142.9°
2029-06-09 Sat 39 — unknown 23:05–00:30 (good, 1.42 h) 50.2° 20:40 4.55 5% 131.3°
2029-06-10 Sun 38 — unknown 23:05–00:25 (good, 1.33 h) 50.2° 20:35 4.53 2% 119.3°
2029-06-11 Mon 35 — unknown 23:10–00:20 (good, 1.17 h) 50.2° 20:30 4.51 0% 107.1°
2029-06-12 Tue 33 — unknown 23:10–00:20 (good, 1.17 h) 50.2° 20:25 4.49 1% 94.6°
2029-06-13 Wed 33 — unknown 23:10–00:15 (good, 1.08 h) 50.2° 20:20 4.48 3% 81.9°
2029-06-14 Thu 30 — unknown 23:10–00:10 (good, 1.0 h) 50.2° 20:20 4.46 8% 69.0°
2029-06-15 Fri 28 — unknown 23:10–00:05 (good, 0.92 h) 50.2° 20:15 4.45 15% 56.0°
2029-06-16 Sat 23 — unknown 23:10–00:05 (good, 0.92 h) 50.2° 20:10 4.44 24% 42.8°
2029-06-17 Sun 19 — unknown 23:10–23:45 (good, 0.58 h) 50.2° 20:05 4.43 34% 29.7°
2029-06-18 Mon 15 — unknown 23:10–23:30 (good, 0.33 h) 50.2° 20:05 4.43 44% 17.3°
2029-06-19 Tue 12 — unknown 23:10–00:20 (marginal, 1.17 h) 50.2° 20:00 4.42 56% 10.1°
2029-06-20 Wed 9 — unknown 23:15–00:05 (marginal, 0.83 h) 50.2° 19:55 4.42 67% 17.3°
2029-06-21 Thu 6 — unknown 23:15–23:55 (marginal, 0.67 h) 50.2° 19:50 4.42 78% 30.1°
2029-06-22 Fri 6 — unknown 23:15–23:50 (marginal, 0.58 h) 50.2° 19:45 4.43 87% 44.0°
2029-06-23 Sat 6 — unknown 23:15–23:50 (marginal, 0.58 h) 50.2° 19:45 4.43 94% 58.0°
2029-06-24 Sun 7 — unknown 23:15–23:50 (marginal, 0.58 h) 50.2° 19:40 4.44 98% 72.1°
2029-06-25 Mon 8 — unknown 23:15–23:55 (marginal, 0.67 h) 50.2° 19:35 4.45 100% 86.1°
2029-06-26 Tue 8 — unknown 23:15–23:50 (marginal, 0.58 h) 50.2° 19:30 4.46 99% 99.8°
2029-06-27 Wed 9 — unknown 22:20–23:10 (marginal, 0.83 h) 50.2° 19:25 4.47 96% 113.2°
2029-06-28 Thu 10 — unknown 22:20–23:45 (marginal, 1.42 h) 50.2° 19:25 4.49 91% 126.1°
2029-06-29 Fri 9 — unknown 22:20–23:40 (marginal, 1.33 h) 50.2° 19:20 4.5 84% 138.6°
2029-06-30 Sat 9 — unknown 22:20–23:35 (marginal, 1.25 h) 50.2° 19:15 4.52 76% 150.6°

Download: CSV · JSON

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2029-06-01&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.