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: 03-06 (64), 03-07 (61), 03-08 (60), 03-09 (56), 03-10 (52) — by astronomy; check the weather when the night is within four days.

2046-03-06astronomy score per night — click a bar for that night2046-04-04

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2046-03-06 Tue	64	—	unknown	19:50–22:25 (good, 2.58 h)	72.6° 17:10	9.41	1%	82.0°
2046-03-07 Wed	61	—	unknown	19:55–22:20 (good, 2.42 h)	72.6° 17:10	9.36	0%	70.2°
2046-03-08 Thu	60	—	unknown	19:55–22:15 (good, 2.33 h)	72.6° 17:05	9.31	1%	58.3°
2046-03-09 Fri	56	—	unknown	19:55–22:10 (good, 2.25 h)	72.6° 17:00	9.26	4%	46.4°
2046-03-10 Sat	52	—	unknown	19:55–22:05 (good, 2.17 h)	72.6° 16:55	9.22	9%	34.5°
2046-03-11 Sun	44	—	unknown	20:00–22:00 (good, 2.0 h)	72.6° 16:50	9.17	15%	22.3°
2046-03-12 Mon	37	—	unknown	20:00–21:50 (good, 1.83 h)	72.6° 16:50	9.12	23%	10.1°
2046-03-13 Tue	30	—	unknown	20:00–21:35 (good, 1.58 h)	72.6° 16:45	9.07	32%	2.6°
2046-03-14 Wed	23	—	unknown	20:00–20:45 (good, 0.75 h)	72.6° 16:40	9.02	42%	15.2°
2046-03-15 Thu	16	—	unknown	20:05–22:05 (marginal, 2.0 h)	72.6° 16:35	8.97	52%	28.4°
2046-03-16 Fri	13	—	unknown	20:05–21:55 (marginal, 1.83 h)	72.6° 16:35	8.92	63%	41.9°
2046-03-17 Sat	13	—	unknown	20:05–21:50 (marginal, 1.75 h)	72.6° 16:30	8.87	74%	55.8°
2046-03-18 Sun	14	—	unknown	20:05–21:50 (marginal, 1.75 h)	72.6° 16:25	8.82	83%	70.3°
2046-03-19 Mon	16	—	unknown	20:10–21:50 (marginal, 1.67 h)	72.6° 16:20	8.77	91%	85.1°
2046-03-20 Tue	20	—	unknown	20:10–21:00 (good, 0.83 h)	72.6° 16:15	8.71	97%	100.1°
2046-03-21 Wed	24	—	unknown	20:10–21:10 (good, 1.0 h)	72.6° 16:15	8.66	100%	115.4°
2046-03-22 Thu	25	—	unknown	20:10–21:10 (good, 1.0 h)	72.6° 16:10	8.61	99%	130.6°
2046-03-23 Fri	27	—	unknown	20:15–21:10 (good, 0.92 h)	72.6° 16:05	8.56	96%	145.6°
2046-03-24 Sat	27	—	unknown	20:15–21:10 (good, 0.92 h)	72.6° 16:00	8.5	90%	160.3°
2046-03-25 Sun	25	—	unknown	21:15–22:10 (good, 0.92 h)	72.6° 16:55	8.45	83%	174.5°
2046-03-26 Mon	23	—	unknown	21:15–22:05 (good, 0.83 h)	72.6° 16:55	8.4	74%	171.7°
2046-03-27 Tue	22	—	unknown	21:20–22:00 (good, 0.67 h)	72.6° 16:50	8.35	64%	158.4°
2046-03-28 Wed	20	—	unknown	21:20–21:55 (good, 0.58 h)	72.6° 16:45	8.29	54%	145.5°
2046-03-29 Thu	19	—	unknown	21:20–21:55 (good, 0.58 h)	72.6° 16:40	8.24	44%	133.0°
2046-03-30 Fri	17	—	unknown	21:20–21:50 (good, 0.5 h)	72.6° 16:40	8.18	34%	120.8°
2046-03-31 Sat	14	—	unknown	21:25–21:45 (good, 0.33 h)	72.6° 16:35	8.13	25%	108.8°
2046-04-01 Sun	13	—	unknown	21:25–21:40 (good, 0.25 h)	72.6° 16:30	8.07	18%	96.9°
2046-04-02 Mon	11	—	unknown	21:25–21:35 (good, 0.17 h)	72.6° 16:25	8.02	11%	85.1°
2046-04-03 Tue	9	—	unknown	21:25–21:35 (good, 0.17 h)	72.6° 16:20	7.96	6%	73.3°
2046-04-04 Wed	7	—	unknown	20:55–21:55 (marginal, 1.0 h)	72.6° 16:20	7.91	2%	61.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2046-03-06&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.