Heilongjiang · China · 50.24° N · 127.49° E
Solar position in Heihe
Sun position, daylight and the best solar panel angle for Heihe — computed for 50.24° N, 127.49° E, 139 m above sea level.
The sun right now
Sun in Heihe today
Sunday, 25 October 2026 · local time UTC+8
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:18 | sun 18° below horizon |
| Nautical dawn | 04:56 | 12° below |
| Civil dawn | 05:34 | 6° below |
| Sunrise | 06:07 | 108° ESE |
| Golden hour ends | 06:54 | sun 6° up |
| Solar noon | 11:13 | 27.7° high |
| Golden hour starts | 15:33 | sun 6° up |
| Sunset | 16:19 | 252° WSW |
| Civil dusk | 16:53 | 6° below |
| Nautical dusk | 17:30 | 12° below |
| Astronomical dusk | 18:08 | 18° below |
| Day length | 10 h 12 min | |
Sun path diagram for Heihe
Where the sun stands in the sky: the centre is straight overhead, the outer ring is the horizon. Numbers mark local clock hours.
- June solstice
- Equinox
- December solstice
- Today
On the June solstice the sun reaches 63.2° at solar noon in Heihe; on the December solstice only 16.4°. Sunrise swings from 50° NE in June to 127° SE in December — a 77° arc along the horizon.
Sunrise, sunset and sun height by month
Values for the 21st of each month, local clock time including daylight saving time.
| Month | Sunrise | Solar noon | Sunset | Day length | Noon elevation |
|---|---|---|---|---|---|
| January | 07:18 | 11:41 | 16:04 | 8 h 46 min | 19.9° |
| February | 06:30 | 11:43 | 16:57 | 10 h 27 min | 29.2° |
| March | 05:31 | 11:37 | 17:43 | 12 h 12 min | 40.0° |
| April | 04:25 | 11:29 | 18:33 | 14 h 08 min | 51.6° |
| May | 03:35 | 11:26 | 19:18 | 15 h 42 min | 59.9° |
| June | 03:19 | 11:31 | 19:44 | 16 h 25 min | 63.2° |
| July | 03:43 | 11:36 | 19:29 | 15 h 46 min | 60.2° |
| August | 04:27 | 11:33 | 18:38 | 14 h 11 min | 51.9° |
| September | 05:14 | 11:22 | 17:31 | 12 h 17 min | 40.5° |
| October | 06:01 | 11:14 | 16:27 | 10 h 26 min | 29.1° |
| November | 06:52 | 11:15 | 15:38 | 8 h 46 min | 19.9° |
| December | 07:26 | 11:27 | 15:28 | 8 h 02 min | 16.4° |
A year of daylight in Heihe
Each column is one day of 2026. Bright: sun above the horizon; soft: civil twilight; line: solar noon. Steps are daylight saving time changes.
Best solar panel angle in Heihe
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
49°collects the most energy over a year: 1574 kWh per kWp.
63°gives the most in the darkest month — the one an off-grid system is sized for.
- Yearly energy
- Worst-month energy
| Tilt | kWh/kWp per year | Share of best year | December kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1123 | 71% | 1.02 | 4.6× |
| 15° | 1350 | 86% | 1.85 | 2.7× |
| 30° | 1503 | 95% | 2.57 | 2.2× |
| 45° | 1571 | 100% | 3.14 | 1.9× |
| 49° year-round best | 1574 | 100% | 3.26 | 1.9× |
| 50° = latitude | 1574 | 100% | 3.29 | 1.9× |
| 60° | 1550 | 98% | 3.52 | 1.8× |
| 63° off-grid best | 1536 | 98% | 3.57 | 1.8× |
| 70° | 1488 | 95% | 3.65 | 1.9× |
| 90° | 1261 | 80% | 3.62 | 2.5× |
A fixed array in Heihe produces the most over a year at 49°. The design month for an off-grid system is December: at 63° it makes 3.57 kWh per kWp a day, 9% more than at 49°, and costs 2% of the yearly total. Why steep panels win winter.
Off-grid solar in Heihe at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 49° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 49° | Mean temp. |
|---|---|---|---|---|---|
| January snow | 1.68 | 4.22 | 4.16 | 3.75 | -24.0 °C |
| February snow | 2.87 | 5.66 | 5.48 | 5.17 | -19.6 °C |
| March snow | 4.35 | 6.64 | 6.18 | 6.16 | -8.6 °C |
| April | 5.00 | 4.89 | 4.35 | 4.99 | 3.2 °C |
| May | 5.46 | 4.21 | 3.62 | 4.47 | 11.9 °C |
| June | 5.81 | 4.05 | 3.38 | 4.31 | 18.6 °C |
| July | 5.42 | 3.95 | 3.26 | 4.09 | 21.5 °C |
| August | 4.69 | 4.07 | 3.40 | 4.03 | 19.3 °C |
| September | 3.82 | 4.54 | 3.92 | 4.26 | 12.0 °C |
| October | 2.58 | 4.31 | 3.88 | 3.88 | 1.6 °C |
| November snow | 1.63 | 4.01 | 3.78 | 3.46 | -11.1 °C |
| December snow | 1.30 | 3.72 | 3.65 | 3.26 | -22.3 °C |
| Year | 3.72 avg | 4.51 avg | 1488 kWh | 1574 kWh |
Sizing example. To run a 1 kWh-per-day load through July on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 360 Wp of panels at 70°, versus 360 Wp at 49°. The steep array is 0% smaller for the same winter. Size your own system.
Row spacing in Heihe
Distance between rows of 2 m long panels (slope length) so that no row shades the next between 10:00 and 14:00 solar time on the winter solstice.
8.7 mrow pitch at 70°
7.8 mrow pitch at 49°
How Heihe compares in China
Against the other 2,094 places in China with climate data, for a fixed array at its best angle.
1173rdof 2,095 places in China for sunshine, shared: 3.72 peak sun hours a day on flat ground.
+25%solar energy a year compared with the average place in China: 1,574 against 1,262 kWh per kWp.
+2 h 14 mindaylight on the longest day, compared with Shanghai: 16 h 25 min against 14 h 11 min.
49°best year-round tilt here; across China it runs from 14° in Haikou to 52° in Xilinji.
Of the 2,095 places in China, Nyêmo gets the most sun (5.75 peak sun hours a day) and Baima and 11 other places the least (2.91); Heihe ranks joint 1173rd. In its darkest month, July, 1 kWp of off-grid panels at 70° makes 3.26 kWh a day here, against 2.06 kWh on average in China. The shortest day lasts 8 h 02 min, −2 h 05 min compared with Shanghai.
Solar forecast for Heihe, next 48 hours
Expected output of 1 kWp at 70°, computed from the ICON-EU weather model of the Deutscher Wetterdienst (DWD), Europe.
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Questions about the sun in Heihe
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A free, live card for Heihe: where the sun is right now on today's path, a countdown to sunset or sunrise, the daylight change, the moon phase at night and the best panel angle.
Sun positions: NREL Solar Position Algorithm. Climate: NASA POWER monthly climatology (NASA Langley Research Center). Forecast: Deutscher Wetterdienst, ICON-EU (CC BY 4.0), processed. Places: GeoNames (CC BY 4.0). Time zones: IANA. Sources and licences.