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: 07-23 (78), 07-22 (74), 07-21 (72), 07-20 (69), 07-19 (61) — by astronomy; check the weather when the night is within four days.

2036-06-24astronomy score per night — click a bar for that night2036-07-23

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2036-06-24 Tue	19	—	unknown	03:15–03:40 (good, 0.42 h)	79.2° 08:40	4.44	1%	74.0°
2036-06-25 Wed	21	—	unknown	03:10–03:40 (good, 0.5 h)	79.1° 08:35	4.45	5%	87.6°
2036-06-26 Thu	23	—	unknown	03:05–03:40 (good, 0.58 h)	79.1° 08:35	4.46	11%	101.2°
2036-06-27 Fri	24	—	unknown	03:00–03:40 (good, 0.67 h)	79.2° 08:30	4.48	20%	114.5°
2036-06-28 Sat	25	—	unknown	03:00–03:40 (good, 0.67 h)	79.2° 08:25	4.49	30%	127.1°
2036-06-29 Sun	28	—	unknown	02:55–03:45 (good, 0.83 h)	79.1° 08:20	4.51	41%	138.7°
2036-06-30 Mon	29	—	unknown	02:50–03:45 (good, 0.92 h)	79.1° 08:20	4.53	52%	148.4°
2036-07-01 Tue	31	—	unknown	02:45–03:45 (good, 1.0 h)	79.1° 08:15	4.55	63%	154.6°
2036-07-02 Wed	31	—	unknown	02:40–03:45 (good, 1.08 h)	79.2° 08:10	4.57	72%	155.0°
2036-07-03 Thu	33	—	unknown	02:45–03:45 (good, 1.0 h)	79.2° 08:05	4.6	81%	149.7°
2036-07-04 Fri	33	—	unknown	02:40–03:45 (good, 1.08 h)	79.1° 08:00	4.63	88%	141.3°
2036-07-05 Sat	32	—	unknown	02:40–03:50 (good, 1.17 h)	79.1° 08:00	4.65	94%	131.4°
2036-07-06 Sun	32	—	unknown	02:35–03:50 (good, 1.25 h)	79.2° 07:55	4.69	98%	121.0°
2036-07-07 Mon	29	—	unknown	02:40–03:50 (good, 1.17 h)	79.2° 07:50	4.72	100%	110.3°
2036-07-08 Tue	26	—	unknown	02:45–03:50 (good, 1.08 h)	79.2° 07:45	4.75	100%	99.5°
2036-07-09 Wed	24	—	unknown	03:10–03:55 (good, 0.75 h)	79.1° 07:40	4.79	98%	88.7°
2036-07-10 Thu	21	—	unknown	01:50–04:45 (marginal, 2.92 h)	79.1° 07:40	4.82	95%	77.9°
2036-07-11 Fri	19	—	unknown	01:45–03:55 (marginal, 2.17 h)	79.2° 07:35	4.86	90%	67.2°
2036-07-12 Sat	18	—	unknown	01:45–03:55 (marginal, 2.17 h)	79.2° 07:30	4.9	83%	56.8°
2036-07-13 Sun	19	—	unknown	01:40–04:00 (marginal, 2.33 h)	79.1° 07:25	4.94	75%	46.6°
2036-07-14 Mon	21	—	unknown	01:30–04:00 (marginal, 2.5 h)	79.1° 07:25	4.98	66%	37.1°
2036-07-15 Tue	26	—	unknown	01:25–04:00 (marginal, 2.58 h)	79.1° 07:20	5.02	57%	29.2°
2036-07-16 Wed	32	—	unknown	02:10–04:00 (good, 1.83 h)	79.2° 07:15	5.07	47%	24.7°
2036-07-17 Thu	42	—	unknown	02:00–04:05 (good, 2.08 h)	79.2° 07:10	5.11	36%	26.0°
2036-07-18 Fri	51	—	unknown	01:40–04:05 (good, 2.42 h)	79.1° 07:05	5.16	26%	32.9°
2036-07-19 Sat	61	—	unknown	01:35–04:05 (good, 2.5 h)	79.1° 07:05	5.2	17%	43.1°
2036-07-20 Sun	69	—	unknown	01:30–04:10 (good, 2.67 h)	79.2° 07:00	5.25	9%	55.1°
2036-07-21 Mon	72	—	unknown	01:30–04:10 (good, 2.67 h)	79.2° 06:55	5.3	3%	68.1°
2036-07-22 Tue	74	—	unknown	01:25–04:10 (good, 2.75 h)	79.2° 06:50	5.35	0%	81.7°
2036-07-23 Wed	78	—	unknown	01:20–04:10 (good, 2.83 h)	79.1° 06:45	5.4	0%	95.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2036-06-24&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.