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: 07-14 (53), 07-15 (53), 07-13 (51), 07-12 (50), 07-11 (48) — by astronomy; check the weather when the night is within four days.

2046-06-19astronomy score per night — click a bar for that night2046-07-18

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2046-06-19 Tue	8	—	unknown	03:05–03:40 (marginal, 0.58 h)	79.2° 09:05	4.42	98%	107.1°
2046-06-20 Wed	7	—	unknown	03:05–03:40 (marginal, 0.58 h)	79.2° 09:00	4.42	94%	94.7°
2046-06-21 Thu	7	—	unknown	03:00–03:40 (marginal, 0.67 h)	79.2° 08:55	4.42	88%	82.6°
2046-06-22 Fri	7	—	unknown	03:00–03:40 (marginal, 0.67 h)	79.2° 08:50	4.43	81%	70.7°
2046-06-23 Sat	7	—	unknown	02:55–03:40 (marginal, 0.75 h)	79.2° 08:45	4.43	73%	59.1°
2046-06-24 Sun	8	—	unknown	02:50–03:40 (marginal, 0.83 h)	79.2° 08:45	4.44	64%	47.7°
2046-06-25 Mon	9	—	unknown	02:45–03:40 (marginal, 0.92 h)	79.2° 08:40	4.45	55%	36.7°
2046-06-26 Tue	12	—	unknown	02:40–03:40 (marginal, 1.0 h)	79.2° 08:35	4.46	45%	26.3°
2046-06-27 Wed	15	—	unknown	03:25–03:40 (good, 0.25 h)	79.2° 08:30	4.47	36%	17.5°
2046-06-28 Thu	18	—	unknown	03:15–03:40 (good, 0.42 h)	79.2° 08:30	4.48	27%	14.3°
2046-06-29 Fri	22	—	unknown	03:05–03:40 (good, 0.58 h)	79.2° 08:25	4.5	19%	19.9°
2046-06-30 Sat	26	—	unknown	02:50–03:45 (good, 0.92 h)	79.2° 08:20	4.52	11%	30.1°
2046-07-01 Sun	29	—	unknown	02:50–03:45 (good, 0.92 h)	79.2° 08:15	4.54	6%	41.9°
2046-07-02 Mon	31	—	unknown	02:45–03:45 (good, 1.0 h)	79.2° 08:10	4.56	2%	54.6°
2046-07-03 Tue	33	—	unknown	02:40–03:45 (good, 1.08 h)	79.2° 08:10	4.59	0%	67.8°
2046-07-04 Wed	34	—	unknown	02:35–03:45 (good, 1.17 h)	79.2° 08:05	4.61	1%	81.4°
2046-07-05 Thu	37	—	unknown	02:35–03:50 (good, 1.25 h)	79.2° 08:00	4.64	4%	95.2°
2046-07-06 Fri	38	—	unknown	02:30–03:50 (good, 1.33 h)	79.2° 07:55	4.67	11%	109.1°
2046-07-07 Sat	40	—	unknown	02:25–03:50 (good, 1.42 h)	79.2° 07:50	4.7	19%	123.0°
2046-07-08 Sun	42	—	unknown	02:20–03:50 (good, 1.5 h)	79.2° 07:50	4.74	29%	136.6°
2046-07-09 Mon	43	—	unknown	02:15–03:50 (good, 1.58 h)	79.2° 07:45	4.77	40%	149.7°
2046-07-10 Tue	46	—	unknown	02:15–03:55 (good, 1.67 h)	79.2° 07:40	4.81	51%	160.9°
2046-07-11 Wed	48	—	unknown	02:10–03:55 (good, 1.75 h)	79.2° 07:35	4.84	62%	165.9°
2046-07-12 Thu	50	—	unknown	02:05–03:55 (good, 1.83 h)	79.2° 07:35	4.88	73%	159.6°
2046-07-13 Fri	51	—	unknown	02:05–03:55 (good, 1.83 h)	79.2° 07:30	4.92	82%	148.5°
2046-07-14 Sat	53	—	unknown	02:05–04:00 (good, 1.92 h)	79.2° 07:25	4.96	90%	136.2°
2046-07-15 Sun	53	—	unknown	02:00–04:00 (good, 2.0 h)	79.2° 07:20	5.01	95%	123.6°
2046-07-16 Mon	45	—	unknown	02:05–04:00 (good, 1.92 h)	79.2° 07:15	5.05	99%	111.1°
2046-07-17 Tue	39	—	unknown	02:10–04:05 (good, 1.92 h)	79.2° 07:15	5.09	100%	98.7°
2046-07-18 Wed	33	—	unknown	02:50–04:05 (good, 1.25 h)	79.2° 07:10	5.14	99%	86.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2046-06-19&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.