Tibet · China · 29.66° N · 94.36° E
Solar position in Bayi
Sun position, daylight and the best solar panel angle for Bayi — computed for 29.66° N, 94.36° E, 2995 m above sea level.
The sun right now
Sun in Bayi today
Sunday, 25 October 2026 · local time UTC+8
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 06:30 | sun 18° below horizon |
| Nautical dawn | 06:58 | 12° below |
| Civil dawn | 07:26 | 6° below |
| Sunrise | 07:50 | 103° ESE |
| Golden hour ends | 08:23 | sun 6° up |
| Solar noon | 13:26 | 48.2° high |
| Golden hour starts | 18:29 | sun 6° up |
| Sunset | 19:02 | 256° WSW |
| Civil dusk | 19:26 | 6° below |
| Nautical dusk | 19:54 | 12° below |
| Astronomical dusk | 20:22 | 18° below |
| Day length | 11 h 12 min | |
Sun path diagram for Bayi
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 83.8° at solar noon in Bayi; on the December solstice only 36.9°. Sunrise swings from 62° ENE in June to 117° ESE in December — a 54° 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 | 08:37 | 13:53 | 19:10 | 10 h 33 min | 40.5° |
| February | 08:16 | 13:56 | 19:35 | 11 h 19 min | 49.8° |
| March | 07:45 | 13:49 | 19:54 | 12 h 09 min | 60.6° |
| April | 07:10 | 13:41 | 20:12 | 13 h 03 min | 72.2° |
| May | 06:46 | 13:39 | 20:31 | 13 h 45 min | 80.5° |
| June | 06:42 | 13:44 | 20:45 | 14 h 03 min | 83.8° |
| July | 06:55 | 13:48 | 20:42 | 13 h 47 min | 80.8° |
| August | 07:13 | 13:45 | 20:17 | 13 h 04 min | 72.4° |
| September | 07:30 | 13:35 | 19:40 | 12 h 11 min | 61.0° |
| October | 07:47 | 13:27 | 19:06 | 11 h 18 min | 49.6° |
| November | 08:11 | 13:28 | 18:44 | 10 h 33 min | 40.4° |
| December | 08:33 | 13:40 | 18:47 | 10 h 14 min | 36.9° |
A year of daylight in Bayi
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 Bayi
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
32°collects the most energy over a year: 1564 kWh per kWp.
21°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 | September kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1385 | 89% | 3.73 | 1.4× |
| 15° | 1511 | 97% | 3.90 | 1.1× |
| 21° off-grid best | 1541 | 99% | 3.91 | 1.1× |
| 30° = latitude | 1563 | 100% | 3.88 | 1.3× |
| 32° year-round best | 1564 | 100% | 3.86 | 1.3× |
| 45° | 1537 | 98% | 3.67 | 1.6× |
| 60° | 1436 | 92% | 3.29 | 2.0× |
| 70° | 1332 | 85% | 2.94 | 2.3× |
| 90° | 1054 | 67% | 2.10 | 3.4× |
A fixed array in Bayi produces the most over a year at 32°. The design month for an off-grid system is September: at 21° it makes 3.91 kWh per kWp a day, 1% more than at 32°, and costs 1% of the yearly total. Why steep panels win winter.
Off-grid solar in Bayi at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 32° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 32° | Mean temp. |
|---|---|---|---|---|---|
| January snow | 3.47 | 5.48 | 5.05 | 4.58 | -5.1 °C |
| February snow | 3.96 | 4.98 | 4.56 | 4.51 | -3.1 °C |
| March snow | 4.61 | 4.27 | 3.86 | 4.51 | -0.6 °C |
| April | 4.84 | 3.29 | 2.92 | 4.13 | 2.6 °C |
| May | 5.00 | 2.90 | 2.53 | 3.95 | 5.8 °C |
| June | 5.11 | 2.80 | 2.40 | 3.87 | 9.0 °C |
| July | 5.17 | 2.91 | 2.49 | 3.95 | 10.4 °C |
| August | 5.17 | 3.28 | 2.83 | 4.16 | 10.2 °C |
| September | 4.41 | 3.38 | 2.94 | 3.86 | 7.9 °C |
| October | 4.04 | 3.99 | 3.55 | 4.10 | 3.5 °C |
| November snow | 3.85 | 5.59 | 5.07 | 4.86 | -0.5 °C |
| December snow | 3.52 | 6.15 | 5.63 | 4.94 | -3.5 °C |
| Year | 4.43 avg | 4.08 avg | 1332 kWh | 1564 kWh |
Sizing example. To run a 1 kWh-per-day load through June on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 490 Wp of panels at 70°, versus 310 Wp at 32°. Here the lower tilt is the better winter choice — the sun stays high enough. Size your own system.
Row spacing in Bayi
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.
3.5 mrow pitch at 70°
3.3 mrow pitch at 32°
How Bayi compares in China
Against the other 2,094 places in China with climate data, for a fixed array at its best angle.
250thof 2,095 places in China for sunshine, shared: 4.43 peak sun hours a day on flat ground.
+24%solar energy a year compared with the average place in China: 1,564 against 1,262 kWh per kWp.
−8 mindaylight on the longest day, compared with Shanghai: 14 h 03 min against 14 h 11 min.
32°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); Bayi ranks joint 250th. In its darkest month, June, 1 kWp of off-grid panels at 70° makes 2.40 kWh a day here, against 2.06 kWh on average in China. The shortest day lasts 10 h 14 min, +7 min compared with Shanghai.
Solar forecast for Bayi, 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 Bayi
What is the best solar panel angle in Bayi?
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Places near Bayi
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A free, live card for Bayi: 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.