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 Vega: 11-04 (84), 11-05 (82), 11-06 (81), 11-07 (79), 11-08 (77) — by astronomy; check the weather when the night is within four days.

2029-11-04astronomy score per night — click a bar for that night2029-12-03

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2029-11-04 Sun	84	—	unknown	18:50–22:00 (good, 3.17 h)	87.1° 16:05	10.62	3%	89.6°
2029-11-05 Mon	82	—	unknown	18:50–22:00 (good, 3.17 h)	87.1° 16:00	10.65	0%	82.0°
2029-11-06 Tue	81	—	unknown	18:45–21:55 (good, 3.17 h)	87.1° 15:55	10.69	1%	74.8°
2029-11-07 Wed	79	—	unknown	18:45–21:50 (good, 3.08 h)	87.1° 15:50	10.72	4%	68.6°
2029-11-08 Thu	77	—	unknown	18:45–21:45 (good, 3.0 h)	87.1° 15:45	10.75	11%	63.7°
2029-11-09 Fri	69	—	unknown	18:45–21:40 (good, 2.92 h)	87.1° 15:45	10.79	19%	60.7°
2029-11-10 Sat	61	—	unknown	18:45–21:40 (good, 2.92 h)	87.1° 15:40	10.82	28%	59.7°
2029-11-11 Sun	52	—	unknown	18:40–21:20 (good, 2.67 h)	87.1° 15:35	10.85	39%	60.5°
2029-11-12 Mon	45	—	unknown	18:40–21:10 (good, 2.5 h)	87.1° 15:30	10.88	49%	62.9°
2029-11-13 Tue	39	—	unknown	18:40–20:55 (good, 2.25 h)	87.1° 15:25	10.91	59%	66.7°
2029-11-14 Wed	35	—	unknown	18:40–20:05 (good, 1.42 h)	87.1° 15:25	10.94	68%	71.4°
2029-11-15 Thu	32	—	unknown	18:40–19:40 (good, 1.0 h)	87.1° 15:20	10.97	77%	76.7°
2029-11-16 Fri	31	—	unknown	18:40–19:35 (good, 0.92 h)	87.1° 15:15	11.0	84%	82.4°
2029-11-17 Sat	31	—	unknown	18:40–19:40 (good, 1.0 h)	87.1° 15:10	11.02	91%	88.3°
2029-11-18 Sun	33	—	unknown	18:40–20:00 (good, 1.33 h)	87.1° 15:10	11.05	95%	94.3°
2029-11-19 Mon	36	—	unknown	18:35–20:25 (good, 1.83 h)	87.1° 15:05	11.08	98%	100.1°
2029-11-20 Tue	39	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 15:00	11.1	100%	105.7°
2029-11-21 Wed	42	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 14:55	11.13	100%	110.7°
2029-11-22 Thu	45	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 14:50	11.15	97%	114.9°
2029-11-23 Fri	51	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 14:50	11.17	93%	118.1°
2029-11-24 Sat	52	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 14:45	11.2	87%	120.0°
2029-11-25 Sun	52	—	unknown	18:35–20:40 (good, 2.08 h)	87.1° 14:40	11.22	80%	120.4°
2029-11-26 Mon	50	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 14:35	11.24	71%	119.1°
2029-11-27 Tue	49	—	unknown	18:35–20:30 (good, 1.92 h)	87.1° 14:30	11.26	61%	116.3°
2029-11-28 Wed	48	—	unknown	18:35–20:25 (good, 1.83 h)	87.1° 14:30	11.28	51%	112.0°
2029-11-29 Thu	46	—	unknown	18:35–20:25 (good, 1.83 h)	87.1° 14:25	11.3	40%	106.5°
2029-11-30 Fri	44	—	unknown	18:35–20:20 (good, 1.75 h)	87.1° 14:20	11.32	29%	100.0°
2029-12-01 Sat	42	—	unknown	18:35–20:15 (good, 1.67 h)	87.1° 14:15	11.34	19%	92.8°
2029-12-02 Sun	41	—	unknown	18:35–20:10 (good, 1.58 h)	87.1° 14:10	11.35	11%	85.3°
2029-12-03 Mon	40	—	unknown	18:35–20:10 (good, 1.58 h)	87.1° 14:10	11.37	4%	78.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2029-11-04&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.