Daily Celestial Overview
Key timings for Friday, October 16
Planetary Hours in Istanbul This Week
| Date | Day ruler | First hour starts | Daytime hour | Nighttime hour |
|---|---|---|---|---|
| Friday, Oct 16 | ♀ Venus | 7:16 AM | 56 min | 65 min |
| Saturday, Oct 17 | ♄ Saturn | 7:17 AM | 55 min | 65 min |
| Sunday, Oct 18 | ☉ Sun | 7:18 AM | 55 min | 65 min |
| Monday, Oct 19 | ☽ Moon | 7:19 AM | 55 min | 65 min |
| Tuesday, Oct 20 | ♂ Mars | 7:20 AM | 55 min | 65 min |
| Wednesday, Oct 21 | ☿ Mercury | 7:21 AM | 54 min | 66 min |
| Thursday, Oct 22 | ♃ Jupiter | 7:23 AM | 54 min | 66 min |
Today's Hours by Planet in Istanbul
Planetary Hours in Istanbul Through 2026
At 41.0° N, the seasons reshape the hours: a daytime hour in Istanbul lasts 46 minutes around Dec 21 and 76 around Jun 21, while the night hours move the opposite way.
Istanbul lies west of the meridian its clocks follow (UTC+3), so the Sun, and with it the first planetary hour, runs about 64 minutes behind the clock: noon by the Sun comes near 1:04 PM standard time.
The shortest day is not the darkest at both ends: Istanbul's earliest sunset comes 14 days before it, on Dec 7, and its latest sunrise 13 days after it, on Jan 3, because solar noon drifts through the year.
| In 2026 | Shortest / earliest | Longest / latest |
|---|---|---|
| Daytime hour | 46.2 min, Dec 21 | 75.7 min, Jun 21 |
| Sunrise (first hour) | 5:31 AM, Jun 8 | 8:29 AM, Jan 3 |
| Sunset (first night hour) | 5:35 PM, Dec 7 | 8:40 PM, Jun 21 |
How These Times Are Calculated
Twelve equal hours run from sunrise to sunset and twelve from sunset to the next sunrise, starting with the weekday's ruler and following the Chaldean order. Every time on this page, today's and the year's, is calculated for these coordinates with a high-precision ephemeris.
Frequently Asked Questions
How long is a planetary hour in Istanbul?
Today a daytime hour in Istanbul lasts about 56 minutes and a nighttime hour about 65. Over 2026 the daytime hour ranges from 46 minutes (Dec 21) to 76 (Jun 21).
Do planetary hours in Istanbul change with daylight saving time?
No. Istanbul stays on UTC+3 all year, so its hours shift only a minute or two a day with the seasons.