How fast the planets move
The bodygraph wheel is divided into 64 gates of 5.625° each, and every gate into six lines of 0.9375°. How long a planet stays in a gate depends on its speed:
- The Moon crosses a gate in about 10 hours and a line in under 2 hours. It is the activation most sensitive to time.
- The Sun and the Earth change line about once a day and gate every 5–6 days.
- Mercury, Venus, Mars change gate over days or weeks.
- The slow planets (Jupiter to Pluto) and the Nodes stay in one gate for weeks or months — an hour makes no difference to them.
A time error shifts not only the black side but the red one too: the Design moment is counted from the moment of birth, so both Moons move together.
What can change
- The Moon's lines — almost always with an error of two hours or more.
- The Moon's gates — if birth is close to a gate boundary. The Moon can complete a channel and so change the centers.
- Type and authority — rarely, but it happens: if the Moon or Mercury completes a channel to the Sacral, the Emotional center or the Throat.
- Profile — if the Sun was close to a line boundary. Then a few hours decide whether you are a 2/4 or a 3/5.
- Incarnation Cross — its angle depends on the profile, so it changes with it.
- Variables — the most sensitive: the Sun's color changes about every 4 hours and its tone every 40 minutes.
If the chart comes out the same in type, authority and profile at different times, you can read the practical part with confidence even without an exact time.
Where to find the exact time
- The birth certificate (the time isn't always shown, but full extracts sometimes have it).
- Hospital records or the mother's medical file.
- Parents and relatives — ask several, since memory drifts.
- Family records, letters, diaries.
The moment that counts is the baby's first breath, not the start of labour.
If you don't know the time
Calculate your chart several times: for the morning, noon and evening of that day. Compare type, authority, profile and the defined centers.
- If they are the same, work with your strategy and authority with confidence and treat the Moon and the Variables as approximate.
- If type or authority changes during the day, narrow the range through life events and self-observation — for example, whether you feel a steady sacral response, or waves of emotion before decisions.
Rectification (estimating the time from life events) exists in Human Design too, but it rests on interpretation and offers no guarantee. It's more honest to work with what doesn't change than to build conclusions on guessed minutes.