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 3C 273: 07-05 (4), 07-06 (3), 07-07 (3), 07-08 (3), 07-09 (2) — by astronomy; check the weather when the night is within four days.

2032-07-05astronomy score per night — click a bar for that night2032-08-03

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-07-05 Mon	4	—	unknown	22:20–22:45 (marginal, 0.42 h)	50.2° 18:55	4.65	3%	100.8°
2032-07-06 Tue	3	—	unknown	22:15–22:45 (marginal, 0.5 h)	50.2° 18:50	4.68	1%	88.5°
2032-07-07 Wed	3	—	unknown	22:15–22:40 (marginal, 0.42 h)	50.2° 18:45	4.72	0%	76.4°
2032-07-08 Thu	3	—	unknown	22:15–22:35 (marginal, 0.33 h)	50.2° 18:45	4.75	2%	64.5°
2032-07-09 Fri	2	—	unknown	22:15–22:30 (marginal, 0.25 h)	50.2° 18:40	4.78	5%	52.7°
2032-07-10 Sat	2	—	unknown	22:15–22:25 (marginal, 0.17 h)	50.2° 18:35	4.82	10%	41.0°
2032-07-11 Sun	2	—	unknown	—	50.2° 18:30	4.86	16%	29.5°
2032-07-12 Mon	1	—	unknown	—	50.2° 18:30	4.9	24%	18.3°
2032-07-13 Tue	1	—	unknown	—	50.2° 18:25	4.94	32%	8.8°
2032-07-14 Wed	1	—	unknown	—	50.2° 18:20	4.98	42%	10.2°
2032-07-15 Thu	1	—	unknown	—	50.2° 18:15	5.02	52%	20.7°
2032-07-16 Fri	0	—	unknown	—	50.2° 18:10	5.07	62%	32.8°
2032-07-17 Sat	0	—	unknown	—	50.2° 18:10	5.11	72%	45.5°
2032-07-18 Sun	0	—	unknown	—	50.2° 18:05	5.16	81%	58.8°
2032-07-19 Mon	0	—	unknown	—	50.2° 18:00	5.2	89%	72.5°
2032-07-20 Tue	0	—	unknown	—	50.2° 17:55	5.25	95%	86.7°
2032-07-21 Wed	0	—	unknown	—	50.2° 17:50	5.3	99%	101.3°
2032-07-22 Thu	0	—	unknown	—	50.2° 17:50	5.35	100%	116.2°
2032-07-23 Fri	0	—	unknown	—	50.2° 17:45	5.4	98%	131.2°
2032-07-24 Sat	0	—	unknown	—	50.2° 17:40	5.45	93%	146.0°
2032-07-25 Sun	0	—	unknown	—	50.2° 17:35	5.5	86%	160.3°
2032-07-26 Mon	0	—	unknown	—	50.2° 17:30	5.55	76%	171.8°
2032-07-27 Tue	0	—	unknown	—	50.2° 17:30	5.61	66%	167.3°
2032-07-28 Wed	0	—	unknown	—	50.2° 17:25	5.66	55%	154.7°
2032-07-29 Thu	0	—	unknown	—	50.2° 17:20	5.71	44%	141.7°
2032-07-30 Fri	0	—	unknown	—	50.2° 17:15	5.77	34%	128.8°
2032-07-31 Sat	0	—	unknown	—	50.2° 17:15	5.82	25%	116.2°
2032-08-01 Sun	0	—	unknown	—	50.2° 17:10	5.88	16%	103.7°
2032-08-02 Mon	0	—	unknown	—	50.2° 17:05	5.93	10%	91.5°
2032-08-03 Tue	0	—	unknown	—	50.2° 17:00	5.99	5%	79.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-07-05&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.