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: 11-15 (67), 11-16 (66), 11-17 (64), 11-18 (62), 11-19 (62) — by astronomy; check the weather when the night is within four days.

2033-11-15astronomy score per night — click a bar for that night2033-12-14

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-11-15 Tue	67	—	unknown	18:40–21:20 (good, 2.67 h)	87.1° 15:20	10.97	30%	104.9°
2033-11-16 Wed	66	—	unknown	18:40–21:15 (good, 2.58 h)	87.1° 15:15	11.0	22%	98.7°
2033-11-17 Thu	64	—	unknown	18:40–21:10 (good, 2.5 h)	87.1° 15:10	11.02	15%	92.3°
2033-11-18 Fri	62	—	unknown	18:40–21:05 (good, 2.42 h)	87.1° 15:10	11.05	9%	85.8°
2033-11-19 Sat	62	—	unknown	18:35–21:05 (good, 2.5 h)	87.1° 15:05	11.08	4%	79.4°
2033-11-20 Sun	60	—	unknown	18:35–21:00 (good, 2.42 h)	87.1° 15:00	11.1	1%	73.3°
2033-11-21 Mon	58	—	unknown	18:35–20:55 (good, 2.33 h)	87.1° 14:55	11.13	0%	67.7°
2033-11-22 Tue	57	—	unknown	18:35–20:50 (good, 2.25 h)	87.1° 14:50	11.15	1%	62.9°
2033-11-23 Wed	56	—	unknown	18:35–20:45 (good, 2.17 h)	87.1° 14:50	11.17	4%	59.3°
2033-11-24 Thu	52	—	unknown	18:35–20:45 (good, 2.17 h)	87.1° 14:45	11.2	8%	57.1°
2033-11-25 Fri	48	—	unknown	18:35–20:40 (good, 2.08 h)	87.1° 14:40	11.22	14%	56.7°
2033-11-26 Sat	42	—	unknown	18:35–20:30 (good, 1.92 h)	87.1° 14:35	11.24	22%	58.2°
2033-11-27 Sun	37	—	unknown	18:35–20:20 (good, 1.75 h)	87.1° 14:30	11.26	32%	61.5°
2033-11-28 Mon	32	—	unknown	18:35–20:10 (good, 1.58 h)	87.1° 14:30	11.28	42%	66.4°
2033-11-29 Tue	28	—	unknown	18:35–20:00 (good, 1.42 h)	87.1° 14:25	11.3	53%	72.5°
2033-11-30 Wed	25	—	unknown	18:35–19:50 (good, 1.25 h)	87.1° 14:20	11.32	64%	79.7°
2033-12-01 Thu	24	—	unknown	18:35–19:35 (good, 1.0 h)	87.1° 14:15	11.34	75%	87.4°
2033-12-02 Fri	24	—	unknown	18:35–19:40 (good, 1.08 h)	87.1° 14:15	11.35	84%	95.4°
2033-12-03 Sat	25	—	unknown	18:35–19:40 (good, 1.08 h)	87.1° 14:10	11.37	92%	103.3°
2033-12-04 Sun	26	—	unknown	18:35–19:45 (good, 1.17 h)	87.1° 14:05	11.38	97%	110.5°
2033-12-05 Mon	28	—	unknown	18:35–19:45 (good, 1.17 h)	87.1° 14:00	11.4	100%	116.5°
2033-12-06 Tue	29	—	unknown	18:35–19:45 (good, 1.17 h)	87.1° 13:55	11.41	99%	120.8°
2033-12-07 Wed	29	—	unknown	18:35–19:45 (good, 1.17 h)	87.1° 13:55	11.42	96%	123.0°
2033-12-08 Thu	32	—	unknown	18:35–19:40 (good, 1.08 h)	87.1° 13:50	11.44	91%	123.0°
2033-12-09 Fri	31	—	unknown	18:35–19:45 (good, 1.17 h)	87.1° 13:45	11.45	84%	120.9°
2033-12-10 Sat	30	—	unknown	18:35–19:40 (good, 1.08 h)	87.1° 13:40	11.46	76%	117.2°
2033-12-11 Sun	29	—	unknown	18:35–19:35 (good, 1.0 h)	87.1° 13:35	11.47	66%	112.3°
2033-12-12 Mon	27	—	unknown	18:35–19:30 (good, 0.92 h)	87.1° 13:35	11.47	57%	106.6°
2033-12-13 Tue	26	—	unknown	18:35–19:30 (good, 0.92 h)	87.1° 13:30	11.48	47%	100.4°
2033-12-14 Wed	25	—	unknown	18:35–19:25 (good, 0.83 h)	87.1° 13:25	11.49	38%	94.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-11-15&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.