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), 11-02 (83), 11-03 (83), 11-06 (83), 11-05 (82) — by astronomy; check the weather when the night is within four days.

2031-10-28astronomy score per night — click a bar for that night2031-11-26

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2031-10-28 Tue	47	—	unknown	18:55–20:45 (good, 1.83 h)	87.1° 16:30	10.34	98%	88.9°
2031-10-29 Wed	53	—	unknown	18:55–21:20 (good, 2.42 h)	87.1° 16:30	10.38	100%	96.1°
2031-10-30 Thu	59	—	unknown	18:55–21:55 (good, 3.0 h)	87.1° 16:25	10.42	100%	103.0°
2031-10-31 Fri	66	—	unknown	18:55–22:00 (good, 3.08 h)	87.1° 16:20	10.46	97%	109.2°
2031-11-01 Sat	71	—	unknown	18:55–22:00 (good, 3.08 h)	87.1° 16:15	10.49	93%	114.5°
2031-11-02 Sun	83	—	unknown	18:50–22:00 (good, 3.17 h)	87.1° 16:10	10.53	87%	118.7°
2031-11-03 Mon	83	—	unknown	18:50–22:00 (good, 3.17 h)	87.1° 16:10	10.57	80%	121.5°
2031-11-04 Tue	84	—	unknown	18:50–22:00 (good, 3.17 h)	87.1° 16:05	10.6	72%	122.7°
2031-11-05 Wed	82	—	unknown	18:50–22:00 (good, 3.17 h)	87.1° 16:00	10.64	63%	122.4°
2031-11-06 Thu	83	—	unknown	18:45–21:55 (good, 3.17 h)	87.1° 15:55	10.67	54%	120.5°
2031-11-07 Fri	81	—	unknown	18:45–21:50 (good, 3.08 h)	87.1° 15:55	10.7	44%	117.3°
2031-11-08 Sat	79	—	unknown	18:45–21:50 (good, 3.08 h)	87.1° 15:50	10.74	35%	112.9°
2031-11-09 Sun	77	—	unknown	18:45–21:45 (good, 3.0 h)	87.1° 15:45	10.77	26%	107.4°
2031-11-10 Mon	75	—	unknown	18:45–21:40 (good, 2.92 h)	87.1° 15:40	10.8	17%	101.2°
2031-11-11 Tue	74	—	unknown	18:45–21:35 (good, 2.83 h)	87.1° 15:35	10.83	10%	94.4°
2031-11-12 Wed	73	—	unknown	18:40–21:30 (good, 2.83 h)	87.1° 15:35	10.86	5%	87.2°
2031-11-13 Thu	71	—	unknown	18:40–21:30 (good, 2.83 h)	87.1° 15:30	10.89	1%	79.9°
2031-11-14 Fri	69	—	unknown	18:40–21:25 (good, 2.75 h)	87.1° 15:25	10.92	0%	72.9°
2031-11-15 Sat	68	—	unknown	18:40–21:20 (good, 2.67 h)	87.1° 15:20	10.95	1%	66.6°
2031-11-16 Sun	67	—	unknown	18:40–21:15 (good, 2.58 h)	87.1° 15:15	10.98	6%	61.6°
2031-11-17 Mon	61	—	unknown	18:40–21:15 (good, 2.58 h)	87.1° 15:15	11.01	12%	58.3°
2031-11-18 Tue	54	—	unknown	18:40–21:10 (good, 2.5 h)	87.1° 15:10	11.04	21%	57.2°
2031-11-19 Wed	47	—	unknown	18:35–20:55 (good, 2.33 h)	87.1° 15:05	11.06	31%	58.5°
2031-11-20 Thu	41	—	unknown	18:35–20:45 (good, 2.17 h)	87.1° 15:00	11.09	42%	61.8°
2031-11-21 Fri	35	—	unknown	18:35–20:30 (good, 1.92 h)	87.1° 15:00	11.11	54%	66.8°
2031-11-22 Sat	30	—	unknown	18:35–20:00 (good, 1.42 h)	87.1° 14:55	11.14	64%	72.9°
2031-11-23 Sun	28	—	unknown	18:35–19:35 (good, 1.0 h)	87.1° 14:50	11.16	75%	79.8°
2031-11-24 Mon	28	—	unknown	18:35–19:30 (good, 0.92 h)	87.1° 14:45	11.19	83%	86.9°
2031-11-25 Tue	29	—	unknown	18:35–19:45 (good, 1.17 h)	87.1° 14:40	11.21	90%	94.0°
2031-11-26 Wed	31	—	unknown	18:35–20:05 (good, 1.5 h)	87.1° 14:40	11.23	96%	100.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2031-10-28&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.