Solarposition.org

Flanders · Belgium · 50.98° N · 4.46° E

Solar position in Zemst

Sun position, daylight and the best solar panel angle for Zemst — computed for 50.98° N, 4.46° E, 11 m above sea level.

Sunrise today08:20108° ESE
Sunset today18:31252° WSW
Best panel angle39°year-round, facing south
Off-grid angle72°best for the darkest month

The sun right now

Azimuth180.0°
Elevation27.2°
At solar noon, 13:26Open on the sun map

Sun in Zemst today

Saturday, 24 October 2026 · local time UTC+2

EventTimeDirection / height
Astronomical dawn06:29sun 18° below horizon
Nautical dawn07:0712° below
Civil dawn07:466° below
Sunrise08:20108° ESE
Golden hour ends09:07sun 6° up
Solar noon13:2627.2° high
Golden hour starts17:44sun 6° up
Sunset18:31252° WSW
Civil dusk19:056° below
Nautical dusk19:4312° below
Astronomical dusk20:2118° below
Day length10 h 11 min

Sun path diagram for Zemst

Where the sun stands in the sky: the centre is straight overhead, the outer ring is the horizon. Numbers mark local clock hours.

15°30°45°60°75°N30°60°E120°150°S210°240°W300°330°June solstice6789101112131415161718192021EquinoxDecember solstice910111213141516Today
  • June solstice
  • Equinox
  • December solstice
  • Today

On the June solstice the sun reaches 62.5° at solar noon in Zemst; on the December solstice only 15.6°. Sunrise swings from 49° NE in June to 128° SE in December — a 78° 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.

MonthSunriseSolar noonSunsetDay lengthNoon elevation
January08:3312:5317:148 h 41 min19.2°
February07:4312:5618:0810 h 26 min28.6°
March06:4212:4918:5612 h 14 min39.4°
April06:3513:4120:4714 h 12 min51.0°
May05:4413:3821:3315 h 49 min59.3°
June05:2713:4322:0016 h 33 min62.5°
July05:5213:4821:4315 h 51 min59.4°
August06:3813:4520:5114 h 13 min51.0°
September07:2613:3419:4212 h 16 min39.6°
October08:1513:2618:3710 h 22 min28.3°
November08:0812:2716:478 h 39 min19.1°
December08:4212:4016:377 h 55 min15.6°

A year of daylight in Zemst

Each column is one day of 2026. Bright: sun above the horizon; soft: civil twilight; line: solar noon. Steps are daylight saving time changes.

00:0003:0006:0009:0012:0015:0018:0021:0000:00JanFebMarAprMayJunJulAugSepOctNovDec

Best solar panel angle in Zemst

Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.

39°collects the most energy over a year: 1103 kWh per kWp.

72°gives the most in the darkest month — the one an off-grid system is sized for.

30%40%50%60%70%80%90%100%0°10°20°30°40°50°60°70°80°90°Best year-round 39°Best worst-month 72°70°Yearly energyWorst-month energy
  • Yearly energy
  • Worst-month energy
TiltkWh/kWp per yearShare of best yearDecember kWh/kWp/dayBest ÷ worst month
0°90382%0.469.7×
15°102693%0.746.3×
30°109399%0.974.7×
39° year-round best1103100%1.084.1×
45°1098100%1.143.7×
51° = latitude108398%1.193.4×
60°104294%1.253.1×
70°97388%1.272.8×
72° off-grid best95787%1.272.8×
90°77070%1.212.3×

A fixed array in Zemst produces the most over a year at 39°. The design month for an off-grid system is December: at 72° it makes 1.27 kWh per kWp a day, 17% more than at 39°, and costs 13% of the yearly total. Why steep panels win winter.

Off-grid solar in Zemst at 70°

Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 39° (year-round best).

012345January: 1.48 (70°)1.5JanFebruary: 2.16 (70°)2.2FebMarch: 3.06 (70°)3.1MarApril: 3.61 (70°)3.6AprMay: 3.39 (70°)3.4MayJune: 3.26 (70°)3.3JunJuly: 3.23 (70°)3.2JulAugust: 3.23 (70°)3.2AugSeptember: 3.24 (70°)3.2SepOctober: 2.48 (70°)2.5OctNovember: 1.58 (70°)1.6NovDecember: 1.27 (70°)1.3Dec39°
MonthSun hours, flatSun hours at 70°kWh/kWp/day at 70°at 39°Mean temp.
January0.791.681.481.302.2 °C
February1.492.442.162.052.8 °C
March2.733.473.063.185.5 °C
April4.294.163.614.229.4 °C
May5.083.973.394.3713.1 °C
June5.463.883.264.4016.5 °C
July5.253.873.234.2818.4 °C
August4.413.853.233.9518.1 °C
September3.343.813.243.5314.9 °C
October1.942.882.482.4410.9 °C
November0.951.811.581.426.5 °C
December0.621.451.271.083.1 °C
Year3.04 avg3.11 avg973 kWh1103 kWh

Sizing example. To run a 1 kWh-per-day load through December on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 930 Wp of panels at 70°, versus 1,090 Wp at 39°. The steep array is 15% smaller for the same winter. Size your own system.

Row spacing in Zemst

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.

9.2 mrow pitch at 70°

7.3 mrow pitch at 39°

Row spacing calculator

How Zemst compares in Belgium

Against the other 222 places in Belgium with climate data, for a fixed array at its best angle.

115thof 223 places in Belgium for sunshine, shared: 3.04 peak sun hours a day on flat ground.

−1%solar energy a year compared with the average place in Belgium: 1,103 against 1,112 kWh per kWp.

+1 mindaylight on the longest day, compared with Brussels: 16 h 33 min against 16 h 31 min.

39°best year-round tilt here; across Belgium it runs from 38° in Brugge to 39° in Brussels.

Of the 223 places in Belgium, Knokke-Heist and one other place get the most sun (3.13 peak sun hours a day) and Eupen the least (3.01); Zemst ranks joint 115th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 1.27 kWh a day here, against 1.30 kWh on average in Belgium. The shortest day lasts 7 h 55 min, −1 min compared with Brussels.

The sunniest places in Belgium

Solar forecast for Zemst, next 48 hours

Expected output of 1 kWp at 70°, computed from the ICON-EU weather model of the Deutscher Wetterdienst (DWD), Europe.

Loading the latest forecast…

Questions about the sun in Zemst

What is the best solar panel angle in Zemst?
For a fixed array facing south, the best year-round tilt in Zemst is 39°, worth about 1103 kWh per kWp a year. An off-grid system that has to get through December does better at about 72°.
What time is sunrise and sunset in Zemst today?
On 24 October 2026 the sun rises at 08:20 and sets at 18:31 local time (UTC+2), giving 10 h 11 min of daylight. Solar noon is at 13:26.
How many peak sun hours does Zemst get?
On a flat surface 3.0 hours a day averaged over the year, from 0.6 in December to 5.5 in June. Panels tilted at 70° receive 1.4 sun hours a day in December.
How high does the sun get in Zemst?
At solar noon the sun stands 62.5° above the horizon on the June solstice and 15.6° on the December solstice.
Is Zemst a good place for solar panels?
With 3.0 peak sun hours a day on flat ground, Zemst ranks joint 115th of 223 places in Belgium for sunshine. A 1 kWp array at the best angle (39°) makes about 1,103 kWh a year here, 1% less than the average place in Belgium.

Places near Zemst

All places in Belgium

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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.