← The journal

Astrology basics

Is a planetary hour always 60 minutes?

Traditional planetary hours divide local daylight and night into twelve parts each. Learn why their length can differ from a clock hour.

A ‘Venus hour’ sounds like a 60-minute slot. In traditional Western astrology, planetary hours follow local sunrise and sunset instead of starting on each clock hour.

Split daylight and night separately

Divide sunrise to sunset into twelve equal daytime parts. Then divide sunset to the next sunrise into twelve equal nighttime parts. The traditional system gives each part the name of one of seven chart bodies.

The length can change

The length of daylight changes with the date and place. When daylight lasts longer, each of its twelve parts lasts longer too. Nighttime parts follow the length of night. So a planetary hour need not last 60 minutes.

A traditional time label

A planetary-hour table may mark a part as a ‘Venus hour.’ This names a slot in an older timing system. It does not guarantee that anything special will happen during it.

A few common questions

Does the first planetary hour start at midnight?

No. In this traditional system, the first daytime part begins at local sunrise and the first nighttime part begins at sunset.

Sources & further reading

These sources explain the traditions and methods covered in this article. They do not establish predictive accuracy.

Keep exploring.

Reading guides · ·

Does My 2027 Reading Start on My Birthday?

Born in November? Your 2027 reading still covers January through December. Pick a month that matters to you.

Read the story ↗

Reading guides · ·

Should You Book a 2027 Flight Based on a Horoscope?

A flight fare alert arrives. Compare two possible months against your time off and budget before you book.

Read the story ↗

Reading guides · ·

2027 Western Astrology or Tojeong: What’s the Difference?

Both Lodestar readings cover 2027 month by month. Compare their starting points and calendars before you choose.

Read the story ↗

Reading guides · ·

What Year Is 2027 in Saju? Dingwei, the Goat, and Ipchun

The Korean lunar calendar calls 2027 Dingwei, the Year of the Goat. A Saju birth chart changes its year pillar at Ipchun, not January 1.

Read the story ↗

Astrology basics · ·

Where did the twelve-sign zodiac come from?

The equal twelve-sign map took shape in ancient Mesopotamia. Learn when it became standard and how its 30-degree parts work.

Read the story ↗

Astrology basics · ·

Can the Sun or Moon be retrograde?

The Sun and Moon do not get a retrograde mark in a standard Earth-centred birth chart. Learn the simple exception to the familiar R label.

Read the story ↗