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: 11-06 (78), 11-07 (78), 11-08 (77), 11-09 (76), 11-05 (75) — by astronomy; check the weather when the night is within four days.

2028-11-02astronomy score per night — click a bar for that night2028-12-01

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2028-11-02 Thu	53	—	unknown	18:50–21:30 (good, 2.67 h)	87.1° 16:10	10.56	100%	100.5°
2028-11-03 Fri	59	—	unknown	18:50–21:40 (good, 2.83 h)	87.1° 16:05	10.59	98%	105.9°
2028-11-04 Sat	64	—	unknown	18:50–21:45 (good, 2.92 h)	87.1° 16:00	10.63	94%	110.7°
2028-11-05 Sun	75	—	unknown	18:50–21:45 (good, 2.92 h)	87.1° 16:00	10.66	88%	114.6°
2028-11-06 Mon	78	—	unknown	18:45–21:45 (good, 3.0 h)	87.1° 15:55	10.69	80%	117.3°
2028-11-07 Tue	78	—	unknown	18:45–21:45 (good, 3.0 h)	87.1° 15:50	10.73	71%	118.6°
2028-11-08 Wed	77	—	unknown	18:45–21:45 (good, 3.0 h)	87.1° 15:45	10.76	61%	118.2°
2028-11-09 Thu	76	—	unknown	18:45–21:40 (good, 2.92 h)	87.1° 15:40	10.79	50%	116.0°
2028-11-10 Fri	74	—	unknown	18:45–21:35 (good, 2.83 h)	87.1° 15:40	10.82	38%	112.3°
2028-11-11 Sat	74	—	unknown	18:40–21:35 (good, 2.92 h)	87.1° 15:35	10.86	28%	107.1°
2028-11-12 Sun	72	—	unknown	18:40–21:30 (good, 2.83 h)	87.1° 15:30	10.89	18%	101.0°
2028-11-13 Mon	70	—	unknown	18:40–21:25 (good, 2.75 h)	87.1° 15:25	10.92	10%	94.2°
2028-11-14 Tue	69	—	unknown	18:40–21:20 (good, 2.67 h)	87.1° 15:20	10.95	4%	87.1°
2028-11-15 Wed	67	—	unknown	18:40–21:20 (good, 2.67 h)	87.1° 15:20	10.97	1%	80.2°
2028-11-16 Thu	65	—	unknown	18:40–21:15 (good, 2.58 h)	87.1° 15:15	11.0	0%	74.0°
2028-11-17 Fri	63	—	unknown	18:40–21:10 (good, 2.5 h)	87.1° 15:10	11.03	2%	68.6°
2028-11-18 Sat	63	—	unknown	18:35–21:05 (good, 2.5 h)	87.1° 15:05	11.06	7%	64.6°
2028-11-19 Sun	58	—	unknown	18:35–21:00 (good, 2.42 h)	87.1° 15:05	11.08	14%	62.1°
2028-11-20 Mon	52	—	unknown	18:35–21:00 (good, 2.42 h)	87.1° 15:00	11.11	21%	61.3°
2028-11-21 Tue	45	—	unknown	18:35–20:45 (good, 2.17 h)	87.1° 14:55	11.13	30%	62.0°
2028-11-22 Wed	39	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 14:50	11.16	40%	64.0°
2028-11-23 Thu	35	—	unknown	18:35–20:25 (good, 1.83 h)	87.1° 14:45	11.18	49%	67.3°
2028-11-24 Fri	30	—	unknown	18:35–20:15 (good, 1.67 h)	87.1° 14:45	11.2	59%	71.4°
2028-11-25 Sat	27	—	unknown	18:35–19:40 (good, 1.08 h)	87.1° 14:40	11.22	68%	76.2°
2028-11-26 Sun	25	—	unknown	18:35–19:20 (good, 0.75 h)	87.1° 14:35	11.25	76%	81.5°
2028-11-27 Mon	24	—	unknown	18:35–19:15 (good, 0.67 h)	87.1° 14:30	11.27	84%	87.1°
2028-11-28 Tue	25	—	unknown	18:35–19:25 (good, 0.83 h)	87.1° 14:25	11.29	90%	92.9°
2028-11-29 Wed	26	—	unknown	18:35–19:40 (good, 1.08 h)	87.1° 14:25	11.3	95%	98.7°
2028-11-30 Thu	27	—	unknown	18:35–19:50 (good, 1.25 h)	87.1° 14:20	11.32	98%	104.3°
2028-12-01 Fri	29	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 14:15	11.34	100%	109.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2028-11-02&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.