Vernal Equinox — Born Hour

Vernal Equinox: day and night equalize at 0° longitude — the balance peak inside Mao month.

Overview

Chun Fen (春分) is Mao month's Zhong Qi at ecliptic longitude 0°. Light and dark share the day.

Pentads: 玄鸟至、雷乃发声、始电. Swallows return in many regions; Chinese calendrical poetry treats this as yin-yang balance.

Customs: egg-standing games, spring outings (踏青), offering to the sun (祭日). Entertainment and rite — not pillar rules.

Use equinox to remember true solar time: near boundary instants, clock time alone can misplace the Hour Pillar.

Kind Zhong Qi · mid-point

Deepens 卯 month.

Culture Custom

The egg-standing game is modern folklore around the equinox balance image; physics allows it on many days, not only equinox.

Three pentads: swallows arrive; thunder sounds; lightning appears.

Classical: at equinox yin and yang are half and half — day equals night.

Month command: Mao mid-point; balanced month climate.

Solar Terms hub wiki

Month command wiki

True Solar Time wiki

Month command wiki

Find Vernal Equinox in the almanac or chart engine output for your birth year and compare the instant with true solar time.

Jie nodes can move the Month Pillar; Zhong Qi deepen the same month without switching branch.

Vernal Equinox is a calendrical node and cultural festival, not a weather guarantee or personal luck verdict.