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 Triangulum Pinwheel: 03-22 (1), 03-23 (1) — by astronomy; check the weather when the night is within four days.

2033-03-22astronomy score per night — click a bar for that night2033-04-20

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-03-22 Tue	1	—	unknown	—	79.1° 13:55	8.6	62%	129.2°
2033-03-23 Wed	1	—	unknown	—	79.1° 13:50	8.55	52%	117.4°
2033-03-24 Thu	0	—	unknown	—	79.1° 13:50	8.5	41%	105.1°
2033-03-25 Fri	0	—	unknown	—	79.1° 13:45	8.44	30%	92.2°
2033-03-26 Sat	0	—	unknown	—	79.1° 13:40	8.39	20%	78.9°
2033-03-27 Sun	0	—	unknown	—	79.1° 14:35	8.34	12%	65.3°
2033-03-28 Mon	0	—	unknown	—	79.1° 14:30	8.28	5%	51.7°
2033-03-29 Tue	0	—	unknown	—	79.1° 14:30	8.23	1%	38.5°
2033-03-30 Wed	0	—	unknown	—	79.1° 14:25	8.18	0%	27.1°
2033-03-31 Thu	0	—	unknown	—	79.1° 14:20	8.12	2%	20.6°
2033-04-01 Fri	0	—	unknown	—	79.1° 14:15	8.07	7%	23.5°
2033-04-02 Sat	0	—	unknown	—	79.1° 14:10	8.01	14%	32.8°
2033-04-03 Sun	0	—	unknown	—	79.1° 14:10	7.96	23%	44.3°
2033-04-04 Mon	0	—	unknown	—	79.1° 14:05	7.9	33%	56.4°
2033-04-05 Tue	0	—	unknown	—	79.1° 14:00	7.84	43%	68.4°
2033-04-06 Wed	0	—	unknown	—	79.1° 13:55	7.79	53%	80.2°
2033-04-07 Thu	0	—	unknown	—	79.1° 13:55	7.73	63%	91.8°
2033-04-08 Fri	0	—	unknown	—	79.1° 13:50	7.68	72%	103.1°
2033-04-09 Sat	0	—	unknown	—	79.1° 13:45	7.62	80%	114.2°
2033-04-10 Sun	0	—	unknown	—	79.1° 13:40	7.56	87%	125.1°
2033-04-11 Mon	0	—	unknown	—	79.1° 13:35	7.51	93%	135.6°
2033-04-12 Tue	0	—	unknown	—	79.1° 13:35	7.45	97%	145.5°
2033-04-13 Wed	0	—	unknown	—	79.1° 13:30	7.39	99%	153.9°
2033-04-14 Thu	0	—	unknown	—	79.1° 13:25	7.33	100%	159.1°
2033-04-15 Fri	0	—	unknown	—	79.1° 13:20	7.28	99%	158.4°
2033-04-16 Sat	0	—	unknown	—	79.1° 13:15	7.22	96%	152.0°
2033-04-17 Sun	0	—	unknown	—	79.1° 13:15	7.16	91%	142.6°
2033-04-18 Mon	0	—	unknown	—	79.1° 13:10	7.1	84%	131.9°
2033-04-19 Tue	0	—	unknown	—	79.1° 13:05	7.04	76%	120.4°
2033-04-20 Wed	0	—	unknown	—	79.1° 13:00	6.99	67%	108.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-03-22&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.