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 Seven Sisters: 07-11 (2), 07-12 (2), 07-07 (1), 07-08 (1), 07-09 (1) — by astronomy; check the weather when the night is within four days.

2032-06-13astronomy score per night — click a bar for that night2032-07-12

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-06-13 Sun	0	—	unknown	—	72.5° 11:35	4.47	30%	90.0°
2032-06-14 Mon	0	—	unknown	—	72.5° 11:35	4.46	39%	101.8°
2032-06-15 Tue	0	—	unknown	—	72.5° 11:30	4.45	48%	113.6°
2032-06-16 Wed	0	—	unknown	—	72.5° 11:25	4.44	58%	125.6°
2032-06-17 Thu	0	—	unknown	—	72.5° 11:20	4.43	67%	137.8°
2032-06-18 Fri	0	—	unknown	—	72.5° 11:15	4.43	76%	150.3°
2032-06-19 Sat	0	—	unknown	—	72.5° 11:15	4.42	85%	162.8°
2032-06-20 Sun	0	—	unknown	—	72.5° 11:10	4.42	92%	173.5°
2032-06-21 Mon	0	—	unknown	—	72.5° 11:05	4.42	97%	167.4°
2032-06-22 Tue	0	—	unknown	—	72.5° 11:00	4.43	100%	154.0°
2032-06-23 Wed	0	—	unknown	—	72.5° 10:55	4.43	100%	139.7°
2032-06-24 Thu	0	—	unknown	—	72.5° 10:55	4.44	97%	125.1°
2032-06-25 Fri	0	—	unknown	—	72.5° 10:50	4.45	91%	110.5°
2032-06-26 Sat	0	—	unknown	—	72.5° 10:45	4.46	84%	95.8°
2032-06-27 Sun	0	—	unknown	—	72.5° 10:40	4.48	74%	81.3°
2032-06-28 Mon	0	—	unknown	—	72.5° 10:40	4.49	63%	67.0°
2032-06-29 Tue	0	—	unknown	—	72.5° 10:35	4.51	52%	53.0°
2032-06-30 Wed	0	—	unknown	—	72.5° 10:30	4.53	41%	39.4°
2032-07-01 Thu	0	—	unknown	—	72.5° 10:25	4.55	30%	26.2°
2032-07-02 Fri	0	—	unknown	—	72.5° 10:20	4.57	21%	13.6°
2032-07-03 Sat	0	—	unknown	—	72.5° 10:20	4.6	13%	6.0°
2032-07-04 Sun	0	—	unknown	—	72.5° 10:15	4.63	7%	14.8°
2032-07-05 Mon	0	—	unknown	—	72.5° 10:10	4.65	3%	26.7°
2032-07-06 Tue	0	—	unknown	—	72.5° 10:05	4.68	1%	38.9°
2032-07-07 Wed	1	—	unknown	—	72.5° 10:00	4.72	0%	51.0°
2032-07-08 Thu	1	—	unknown	—	72.5° 10:00	4.75	2%	62.9°
2032-07-09 Fri	1	—	unknown	—	72.5° 09:55	4.78	5%	74.8°
2032-07-10 Sat	1	—	unknown	—	72.5° 09:50	4.82	10%	86.6°
2032-07-11 Sun	2	—	unknown	04:40–04:45 (marginal, 0.08 h)	72.5° 09:45	4.86	16%	98.3°
2032-07-12 Mon	2	—	unknown	04:35–04:45 (marginal, 0.17 h)	72.5° 09:45	4.9	24%	110.1°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-06-13&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.