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 North America Nebula: 01-07 (43), 01-06 (42), 01-08 (42), 01-09 (41), 01-05 (39) — by astronomy; check the weather when the night is within four days.

2034-01-03astronomy score per night — click a bar for that night2034-02-01

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2034-01-03 Tue	34	—	unknown	18:45–20:20 (good, 1.58 h)	87.2° 14:30	11.43	99%	106.2°
2034-01-04 Wed	36	—	unknown	18:45–20:25 (good, 1.67 h)	87.2° 14:25	11.41	100%	113.1°
2034-01-05 Thu	39	—	unknown	18:45–20:25 (good, 1.67 h)	87.2° 14:20	11.4	98%	118.7°
2034-01-06 Fri	42	—	unknown	18:50–20:25 (good, 1.58 h)	87.2° 14:15	11.39	95%	122.7°
2034-01-07 Sat	43	—	unknown	18:50–20:25 (good, 1.58 h)	87.2° 14:10	11.37	89%	124.7°
2034-01-08 Sun	42	—	unknown	18:50–20:30 (good, 1.67 h)	87.2° 14:10	11.36	82%	124.8°
2034-01-09 Mon	41	—	unknown	18:50–20:25 (good, 1.58 h)	87.2° 14:05	11.34	74%	123.1°
2034-01-10 Tue	38	—	unknown	18:50–20:20 (good, 1.5 h)	87.2° 14:00	11.32	65%	119.7°
2034-01-11 Wed	37	—	unknown	18:50–20:15 (good, 1.42 h)	87.2° 13:55	11.3	56%	115.1°
2034-01-12 Thu	35	—	unknown	18:55–20:15 (good, 1.33 h)	87.2° 13:55	11.29	46%	109.7°
2034-01-13 Fri	34	—	unknown	18:55–20:10 (good, 1.25 h)	87.2° 13:50	11.27	37%	103.5°
2034-01-14 Sat	32	—	unknown	18:55–20:05 (good, 1.17 h)	87.2° 13:45	11.24	28%	96.9°
2034-01-15 Sun	30	—	unknown	18:55–20:00 (good, 1.08 h)	87.2° 13:40	11.22	20%	90.0°
2034-01-16 Mon	29	—	unknown	18:55–19:55 (good, 1.0 h)	87.2° 13:35	11.2	13%	83.0°
2034-01-17 Tue	27	—	unknown	19:00–19:55 (good, 0.92 h)	87.2° 13:35	11.18	7%	76.0°
2034-01-18 Wed	26	—	unknown	19:00–19:50 (good, 0.83 h)	87.2° 13:30	11.16	3%	69.4°
2034-01-19 Thu	25	—	unknown	19:00–19:45 (good, 0.75 h)	87.2° 13:25	11.13	0%	63.5°
2034-01-20 Fri	23	—	unknown	19:00–19:40 (good, 0.67 h)	87.2° 13:20	11.11	0%	58.8°
2034-01-21 Sat	23	—	unknown	19:00–19:40 (good, 0.67 h)	87.2° 13:15	11.08	3%	55.9°
2034-01-22 Sun	19	—	unknown	19:05–19:30 (good, 0.42 h)	87.2° 13:15	11.05	8%	55.1°
2034-01-23 Mon	17	—	unknown	19:05–19:25 (good, 0.33 h)	87.2° 13:10	11.03	15%	56.7°
2034-01-24 Tue	14	—	unknown	19:05–19:15 (good, 0.17 h)	87.2° 13:05	11.0	24%	60.5°
2034-01-25 Wed	11	—	unknown	18:35–19:55 (marginal, 1.33 h)	87.2° 13:00	10.97	34%	66.0°
2034-01-26 Thu	9	—	unknown	19:10–19:55 (marginal, 0.75 h)	87.2° 13:00	10.94	45%	72.8°
2034-01-27 Fri	8	—	unknown	19:10–19:50 (marginal, 0.67 h)	87.2° 12:55	10.91	57%	80.4°
2034-01-28 Sat	8	—	unknown	19:10–19:45 (marginal, 0.58 h)	87.2° 12:50	10.88	68%	88.3°
2034-01-29 Sun	7	—	unknown	19:10–19:40 (marginal, 0.5 h)	87.2° 12:45	10.85	78%	96.3°
2034-01-30 Mon	7	—	unknown	19:10–19:35 (marginal, 0.42 h)	87.2° 12:40	10.82	86%	104.0°
2034-01-31 Tue	8	—	unknown	19:15–19:35 (marginal, 0.33 h)	87.2° 12:40	10.79	93%	110.9°
2034-02-01 Wed	7	—	unknown	05:40–06:00 (marginal, 0.33 h)	87.2° 12:35	10.76	97%	116.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2034-01-03&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.