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: 11-17 (63), 11-18 (63), 11-19 (58), 11-20 (52), 11-21 (45) — by astronomy; check the weather when the night is within four days.

2028-11-17astronomy score per night — click a bar for that night2028-12-16

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2028-12-02 Sat	31	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 14:10	11.36	99%	113.7°
2028-12-03 Sun	32	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 14:10	11.37	96%	116.9°
2028-12-04 Mon	36	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 14:05	11.39	91%	118.6°
2028-12-05 Tue	36	—	unknown	18:35–20:00 (good, 1.42 h)	87.1° 14:00	11.4	84%	118.6°
2028-12-06 Wed	35	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 13:55	11.41	75%	116.8°
2028-12-07 Thu	34	—	unknown	18:35–19:50 (good, 1.25 h)	87.1° 13:50	11.43	65%	113.4°
2028-12-08 Fri	32	—	unknown	18:35–19:45 (good, 1.17 h)	87.1° 13:50	11.44	54%	108.6°
2028-12-09 Sat	31	—	unknown	18:35–19:45 (good, 1.17 h)	87.1° 13:45	11.45	42%	102.8°
2028-12-10 Sun	29	—	unknown	18:35–19:40 (good, 1.08 h)	87.1° 13:40	11.46	31%	96.3°
2028-12-11 Mon	28	—	unknown	18:35–19:35 (good, 1.0 h)	87.1° 13:35	11.47	21%	89.5°
2028-12-12 Tue	27	—	unknown	18:35–19:30 (good, 0.92 h)	87.1° 13:30	11.48	12%	82.7°
2028-12-13 Wed	26	—	unknown	18:35–19:30 (good, 0.92 h)	87.1° 13:30	11.48	6%	76.2°
2028-12-14 Thu	25	—	unknown	18:35–19:25 (good, 0.83 h)	87.1° 13:25	11.49	2%	70.6°
2028-12-15 Fri	23	—	unknown	18:35–19:20 (good, 0.75 h)	87.1° 13:20	11.49	0%	66.0°
2028-12-16 Sat	22	—	unknown	18:35–19:15 (good, 0.67 h)	87.1° 13:15	11.5	1%	62.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2028-11-17&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.