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: 03-16 (3), 03-17 (2), 03-18 (1), 03-19 (1), 03-20 (1) — by astronomy; check the weather when the night is within four days.

2032-03-16astronomy score per night — click a bar for that night2032-04-14

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-03-16 Tue	3	—	unknown	20:05–20:20 (marginal, 0.25 h)	79.1° 14:20	8.9	31%	37.6°
2032-03-17 Wed	2	—	unknown	20:05–20:15 (marginal, 0.17 h)	79.1° 14:15	8.85	41%	48.8°
2032-03-18 Thu	1	—	unknown	20:05–20:10 (marginal, 0.08 h)	79.1° 14:10	8.8	51%	60.1°
2032-03-19 Fri	1	—	unknown	—	79.1° 14:05	8.75	60%	71.3°
2032-03-20 Sat	1	—	unknown	—	79.1° 14:00	8.69	69%	82.6°
2032-03-21 Sun	0	—	unknown	—	79.1° 14:00	8.64	78%	93.8°
2032-03-22 Mon	0	—	unknown	—	79.1° 13:55	8.59	85%	105.0°
2032-03-23 Tue	0	—	unknown	—	79.1° 13:50	8.54	91%	116.1°
2032-03-24 Wed	0	—	unknown	—	79.1° 13:45	8.48	96%	127.2°
2032-03-25 Thu	0	—	unknown	—	79.1° 13:45	8.43	99%	138.1°
2032-03-26 Fri	0	—	unknown	—	79.1° 13:40	8.38	100%	148.5°
2032-03-27 Sat	0	—	unknown	—	79.1° 13:35	8.32	99%	157.2°
2032-03-28 Sun	0	—	unknown	—	79.1° 14:30	8.27	96%	161.3°
2032-03-29 Mon	0	—	unknown	—	79.1° 14:25	8.22	92%	157.8°
2032-03-30 Tue	0	—	unknown	—	79.1° 14:25	8.16	85%	148.9°
2032-03-31 Wed	0	—	unknown	—	79.1° 14:20	8.11	76%	137.7°
2032-04-01 Thu	0	—	unknown	—	79.1° 14:15	8.05	66%	125.5°
2032-04-02 Fri	0	—	unknown	—	79.1° 14:10	8.0	56%	112.7°
2032-04-03 Sat	0	—	unknown	—	79.1° 14:05	7.94	44%	99.5°
2032-04-04 Sun	0	—	unknown	—	79.1° 14:05	7.89	33%	86.0°
2032-04-05 Mon	0	—	unknown	—	79.1° 14:00	7.83	23%	72.4°
2032-04-06 Tue	0	—	unknown	—	79.1° 13:55	7.77	14%	58.8°
2032-04-07 Wed	0	—	unknown	—	79.1° 13:50	7.72	6%	45.5°
2032-04-08 Thu	0	—	unknown	—	79.1° 13:50	7.66	2%	33.0°
2032-04-09 Fri	0	—	unknown	—	79.1° 13:45	7.61	0%	22.8°
2032-04-10 Sat	0	—	unknown	—	79.1° 13:40	7.55	1%	18.7°
2032-04-11 Sun	0	—	unknown	—	79.1° 13:35	7.49	4%	23.6°
2032-04-12 Mon	0	—	unknown	—	79.1° 13:30	7.43	10%	33.3°
2032-04-13 Tue	0	—	unknown	—	79.1° 13:30	7.38	16%	44.5°
2032-04-14 Wed	0	—	unknown	—	79.1° 13:25	7.32	25%	56.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-03-16&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.