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: 06-05 (2), 06-01 (1), 06-02 (1), 06-03 (1), 06-04 (1) — by astronomy; check the weather when the night is within four days.

2032-05-07astronomy score per night — click a bar for that night2032-06-05

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-05-07 Fri	0	—	unknown	—	79.1° 11:50	5.99	3%	19.2°
2032-05-08 Sat	0	—	unknown	—	79.1° 11:45	5.93	0%	20.9°
2032-05-09 Sun	0	—	unknown	—	79.1° 11:40	5.88	0%	29.3°
2032-05-10 Mon	0	—	unknown	—	79.1° 11:40	5.82	2%	40.1°
2032-05-11 Tue	0	—	unknown	—	79.1° 11:35	5.76	6%	51.6°
2032-05-12 Wed	0	—	unknown	—	79.1° 11:30	5.71	12%	63.3°
2032-05-13 Thu	0	—	unknown	—	79.1° 11:25	5.66	19%	74.9°
2032-05-14 Fri	0	—	unknown	—	79.1° 11:20	5.6	27%	86.3°
2032-05-15 Sat	0	—	unknown	—	79.1° 11:20	5.55	36%	97.6°
2032-05-16 Sun	0	—	unknown	—	79.1° 11:15	5.5	46%	108.8°
2032-05-17 Mon	0	—	unknown	—	79.1° 11:10	5.44	55%	119.9°
2032-05-18 Tue	0	—	unknown	—	79.1° 11:05	5.39	64%	130.8°
2032-05-19 Wed	0	—	unknown	—	79.1° 11:05	5.34	73%	141.5°
2032-05-20 Thu	0	—	unknown	—	79.1° 11:00	5.29	82%	151.5°
2032-05-21 Fri	0	—	unknown	—	79.1° 10:55	5.24	89%	159.2°
2032-05-22 Sat	0	—	unknown	—	79.1° 10:50	5.2	94%	160.9°
2032-05-23 Sun	0	—	unknown	—	79.1° 10:45	5.15	98%	154.9°
2032-05-24 Mon	0	—	unknown	—	79.1° 10:45	5.1	100%	144.6°
2032-05-25 Tue	0	—	unknown	—	79.1° 10:40	5.06	99%	132.5°
2032-05-26 Wed	0	—	unknown	—	79.1° 10:35	5.01	96%	119.5°
2032-05-27 Thu	0	—	unknown	—	79.1° 10:30	4.97	90%	106.1°
2032-05-28 Fri	0	—	unknown	—	79.1° 10:25	4.93	82%	92.5°
2032-05-29 Sat	0	—	unknown	—	79.1° 10:25	4.89	72%	78.9°
2032-05-30 Sun	0	—	unknown	—	79.1° 10:20	4.85	61%	65.4°
2032-05-31 Mon	0	—	unknown	—	79.1° 10:15	4.81	49%	52.3°
2032-06-01 Tue	1	—	unknown	—	79.1° 10:10	4.78	38%	39.8°
2032-06-02 Wed	1	—	unknown	—	79.1° 10:10	4.74	28%	28.5°
2032-06-03 Thu	1	—	unknown	—	79.1° 10:05	4.71	18%	20.4°
2032-06-04 Fri	1	—	unknown	—	79.1° 10:00	4.68	11%	19.5°
2032-06-05 Sat	2	—	unknown	04:30–04:35 (marginal, 0.08 h)	79.1° 09:55	4.65	5%	26.3°

Download: CSV · JSON

💡 API

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