Daily Celestial Overview
Key timings for Thursday, October 15
Planetary Hours in Chicago This Week
| Date | Day ruler | First hour starts | Daytime hour | Nighttime hour |
|---|---|---|---|---|
| Thursday, Oct 15 | ♃ Jupiter | 7:02 AM | 56 min | 65 min |
| Friday, Oct 16 | ♀ Venus | 7:03 AM | 55 min | 65 min |
| Saturday, Oct 17 | ♄ Saturn | 7:05 AM | 55 min | 65 min |
| Sunday, Oct 18 | ☉ Sun | 7:06 AM | 55 min | 65 min |
| Monday, Oct 19 | ☽ Moon | 7:07 AM | 55 min | 65 min |
| Tuesday, Oct 20 | ♂ Mars | 7:08 AM | 54 min | 66 min |
| Wednesday, Oct 21 | ☿ Mercury | 7:09 AM | 54 min | 66 min |
Today's Hours by Planet in Chicago
Planetary Hours in Chicago Through 2026
At 41.9° N, the seasons reshape the hours: a daytime hour in Chicago lasts 46 minutes around Dec 21 and 76 around Jun 21, while the night hours move the opposite way.
Clocks in Chicago go forward an hour on Mar 8 and back on Nov 1. The planetary hours follow the Sun, so the hours themselves don't move; only their clock times jump by an hour overnight.
By the clock, Chicago's latest sunrise of the year comes on Oct 31 (7:21 AM), the last morning before clocks go back, not on the shortest day.
| In 2026 | Shortest / earliest | Longest / latest |
|---|---|---|
| Daytime hour | 45.7 min, Dec 21 | 76.2 min, Jun 21 |
| Sunrise (first hour) | 5:14 AM, Jun 10 | 7:21 AM, Oct 31 |
| Sunset (first night hour) | 4:19 PM, Dec 5 | 8:30 PM, Jun 25 |
Clock Changes in Chicago, 2026
| Date | Clocks go | First hour, day before | First hour, that day |
|---|---|---|---|
| Mar 8 | Forward an hour | 6:15 AM | 7:13 AM |
| Nov 1 | Back an hour | 7:21 AM | 6:22 AM |
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 Chicago?
Today a daytime hour in Chicago 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 Chicago change with daylight saving time?
Their clock times do. On Mar 8 (clocks forward) and Nov 1 (clocks back), sunrise and every hour after it jump by an hour on the clock: the first hour started at 6:15 AM the day before Mar 8 and at 7:13 AM that day.