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: 07-05 (38), 07-06 (38), 07-07 (38), 07-18 (37), 07-04 (35) — by astronomy; check the weather when the night is within four days.

2044-06-19astronomy score per night — click a bar for that night2044-07-18

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2044-06-19 Sun	7	—	unknown	03:05–03:40 (marginal, 0.58 h)	79.2° 09:00	4.42	37%	25.1°
2044-06-20 Mon	10	—	unknown	03:00–03:40 (marginal, 0.67 h)	79.2° 08:55	4.42	27%	16.7°
2044-06-21 Tue	12	—	unknown	03:35–03:40 (good, 0.08 h)	79.2° 08:55	4.42	17%	17.4°
2044-06-22 Wed	14	—	unknown	03:20–03:40 (good, 0.33 h)	79.2° 08:50	4.43	9%	27.0°
2044-06-23 Thu	17	—	unknown	03:20–03:40 (good, 0.33 h)	79.2° 08:45	4.43	4%	40.0°
2044-06-24 Fri	19	—	unknown	03:15–03:40 (good, 0.42 h)	79.2° 08:40	4.44	1%	54.1°
2044-06-25 Sat	21	—	unknown	03:10–03:40 (good, 0.5 h)	79.2° 08:35	4.45	0%	68.6°
2044-06-26 Sun	23	—	unknown	03:05–03:40 (good, 0.58 h)	79.2° 08:35	4.46	4%	83.2°
2044-06-27 Mon	24	—	unknown	03:00–03:40 (good, 0.67 h)	79.2° 08:30	4.48	9%	97.6°
2044-06-28 Tue	25	—	unknown	03:00–03:40 (good, 0.67 h)	79.2° 08:25	4.49	17%	111.6°
2044-06-29 Wed	28	—	unknown	02:55–03:45 (good, 0.83 h)	79.2° 08:20	4.51	26%	125.0°
2044-06-30 Thu	29	—	unknown	02:50–03:45 (good, 0.92 h)	79.2° 08:20	4.53	37%	137.8°
2044-07-01 Fri	30	—	unknown	02:45–03:45 (good, 1.0 h)	79.2° 08:15	4.55	47%	149.5°
2044-07-02 Sat	31	—	unknown	02:40–03:45 (good, 1.08 h)	79.2° 08:10	4.58	57%	159.4°
2044-07-03 Sun	34	—	unknown	02:40–03:45 (good, 1.08 h)	79.2° 08:05	4.6	67%	164.5°
2044-07-04 Mon	35	—	unknown	02:35–03:45 (good, 1.17 h)	79.2° 08:00	4.63	76%	161.2°
2044-07-05 Tue	38	—	unknown	02:30–03:50 (good, 1.33 h)	79.2° 08:00	4.66	84%	152.6°
2044-07-06 Wed	38	—	unknown	02:35–03:50 (good, 1.25 h)	79.2° 07:55	4.69	90%	142.3°
2044-07-07 Thu	38	—	unknown	02:30–03:50 (good, 1.33 h)	79.2° 07:50	4.72	95%	131.4°
2044-07-08 Fri	35	—	unknown	02:30–03:50 (good, 1.33 h)	79.2° 07:45	4.75	98%	120.2°
2044-07-09 Sat	33	—	unknown	02:30–03:55 (good, 1.42 h)	79.2° 07:40	4.79	100%	108.9°
2044-07-10 Sun	29	—	unknown	02:35–03:55 (good, 1.33 h)	79.2° 07:40	4.82	100%	97.5°
2044-07-11 Mon	25	—	unknown	03:05–03:55 (good, 0.83 h)	79.2° 07:35	4.86	97%	85.9°
2044-07-12 Tue	22	—	unknown	01:40–03:55 (marginal, 2.25 h)	79.2° 07:30	4.9	94%	74.3°
2044-07-13 Wed	20	—	unknown	01:40–04:00 (marginal, 2.33 h)	79.2° 07:25	4.94	88%	62.6°
2044-07-14 Thu	19	—	unknown	01:40–04:00 (marginal, 2.33 h)	79.2° 07:25	4.98	81%	50.8°
2044-07-15 Fri	19	—	unknown	01:30–04:00 (marginal, 2.5 h)	79.2° 07:20	5.03	72%	39.2°
2044-07-16 Sat	21	—	unknown	01:25–04:00 (marginal, 2.58 h)	79.2° 07:15	5.07	62%	27.9°
2044-07-17 Sun	28	—	unknown	03:20–04:05 (good, 0.75 h)	79.2° 07:10	5.11	52%	18.5°
2044-07-18 Mon	37	—	unknown	02:00–04:05 (good, 2.08 h)	79.2° 07:05	5.16	41%	15.6°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2044-06-19&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.