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 Seven Sisters: 08-16 (66), 08-15 (63), 08-14 (60), 08-13 (58), 08-12 (57) — by astronomy; check the weather when the night is within four days.

2032-07-18astronomy score per night — click a bar for that night2032-08-16

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-07-18 Sun	7	—	unknown	04:15–04:50 (marginal, 0.58 h)	72.5° 09:20	5.16	81%	171.8°
2032-07-19 Mon	8	—	unknown	04:10–04:55 (marginal, 0.75 h)	72.5° 09:15	5.2	89%	159.7°
2032-07-20 Tue	9	—	unknown	03:40–04:55 (marginal, 1.25 h)	72.5° 09:10	5.25	95%	145.8°
2032-07-21 Wed	9	—	unknown	03:35–04:55 (marginal, 1.33 h)	72.5° 09:05	5.3	99%	131.3°
2032-07-22 Thu	10	—	unknown	03:30–04:55 (marginal, 1.42 h)	72.5° 09:05	5.35	100%	116.4°
2032-07-23 Fri	9	—	unknown	03:25–04:10 (marginal, 0.75 h)	72.5° 09:00	5.4	98%	101.4°
2032-07-24 Sat	9	—	unknown	03:25–04:15 (marginal, 0.83 h)	72.5° 08:55	5.45	93%	86.4°
2032-07-25 Sun	8	—	unknown	03:30–04:15 (marginal, 0.75 h)	72.5° 08:50	5.5	86%	71.6°
2032-07-26 Mon	7	—	unknown	03:30–04:15 (marginal, 0.75 h)	72.5° 08:50	5.55	76%	57.0°
2032-07-27 Tue	8	—	unknown	03:25–04:20 (marginal, 0.92 h)	72.5° 08:45	5.61	66%	42.9°
2032-07-28 Wed	10	—	unknown	03:15–04:20 (marginal, 1.08 h)	72.5° 08:40	5.66	55%	29.3°
2032-07-29 Thu	14	—	unknown	03:00–04:20 (marginal, 1.33 h)	72.5° 08:35	5.71	44%	16.5°
2032-07-30 Fri	18	—	unknown	03:45–04:25 (good, 0.67 h)	72.5° 08:30	5.77	34%	6.6°
2032-07-31 Sat	23	—	unknown	03:35–04:25 (good, 0.83 h)	72.5° 08:30	5.82	25%	12.3°
2032-08-01 Sun	27	—	unknown	03:25–04:25 (good, 1.0 h)	72.5° 08:25	5.88	16%	23.9°
2032-08-02 Mon	33	—	unknown	03:15–04:30 (good, 1.25 h)	72.5° 08:20	5.93	10%	35.9°
2032-08-03 Tue	36	—	unknown	03:10–04:30 (good, 1.33 h)	72.5° 08:15	5.99	5%	47.9°
2032-08-04 Wed	38	—	unknown	03:05–04:30 (good, 1.42 h)	72.5° 08:10	6.05	2%	59.9°
2032-08-05 Thu	41	—	unknown	03:00–04:35 (good, 1.58 h)	72.5° 08:10	6.1	0%	71.7°
2032-08-06 Fri	43	—	unknown	03:00–04:35 (good, 1.58 h)	72.5° 08:05	6.16	1%	83.5°
2032-08-07 Sat	44	—	unknown	02:55–04:35 (good, 1.67 h)	72.5° 08:00	6.22	3%	95.2°
2032-08-08 Sun	46	—	unknown	02:50–04:35 (good, 1.75 h)	72.5° 07:55	6.27	7%	107.0°
2032-08-09 Mon	49	—	unknown	02:45–04:40 (good, 1.92 h)	72.5° 07:50	6.33	12%	118.7°
2032-08-10 Tue	51	—	unknown	02:45–04:40 (good, 1.92 h)	72.5° 07:50	6.39	19%	130.6°
2032-08-11 Wed	53	—	unknown	02:40–04:40 (good, 2.0 h)	72.5° 07:45	6.44	27%	142.5°
2032-08-12 Thu	57	—	unknown	02:35–04:45 (good, 2.17 h)	72.5° 07:40	6.5	36%	154.5°
2032-08-13 Fri	58	—	unknown	02:30–04:45 (good, 2.25 h)	72.5° 07:35	6.56	46%	166.3°
2032-08-14 Sat	60	—	unknown	02:25–04:45 (good, 2.33 h)	72.5° 07:35	6.62	56%	173.6°
2032-08-15 Sun	63	—	unknown	02:25–04:50 (good, 2.42 h)	72.5° 07:30	6.67	67%	164.6°
2032-08-16 Mon	66	—	unknown	02:20–04:50 (good, 2.5 h)	72.5° 07:25	6.73	77%	151.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-07-18&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.