Why does the birth time matter so much?

Because the rising sign changes sign roughly every two hours, and the houses move with it. The planets, on the other hand, move slowly: a few minutes off, and their positions hold. So it is the rising sign that pays the price of a vague time, not the rest of the chart.

Could the positions differ from another site?

Between two serious sites, the planetary positions agree: the sky is the same for everyone. The small gaps you may see come down to display conventions: the time zone of the hours, the rounding of the degrees, the house system chosen. On the almanac, times are given in Paris time.

Are the site’s pages kept up to date?

Every night. The dated horoscopes, the lunar calendar and the sky’s events are recalculated from the ephemeris at each rebuild of the site: the values you read are today’s, not an archived snapshot.

Help · your calculations

Are the calculations really accurate? yes, and the only uncertainty left comes from you.

Yes. Nohemia’s planetary positions come out of modern astronomical routines, the same family of calculations as professional ephemerides: the precision plays out well beyond anything an interpretation could tell apart. Nothing is copied from a book or keyed in by hand: seasons, retrogrades, moon phases and charts are recalculated from the ephemeris. The only uncertainty that matters comes from elsewhere: the birth time you provide.

The essentials

Engine: a computed astronomical ephemeris, nothing copied
Computation precision: beyond anything an interpretation could tell apart
Times shown: down to the minute, in Paris time on the almanac
The real variable: how precise your birth time is
The place: your city is enough: a few kilometers do not shift a rising sign

Where do the numbers come from?

Every position you read on Nohemia comes from an astronomical calculation, never a copied table. The routines we use belong to the same family as professional ephemerides: they place each planet back on the zodiac at the requested moment, and their precision plays out well beyond anything an interpretation could tell apart.

In practice: the next full moon is dated to the minute, in Paris time; retrogrades are calculated station after station; each astrological season begins at the Sun’s exact entry into its sign. And when you calculate your chart, each planet is set to the degree, at the minute of your birth.

The real variable is your time

The uncertainty never comes from the calculation; it comes from the time you provide. A time read off your birth certificate gives a reliable rising sign; an "around eight o’clock" gives a likely one; an unknown time leaves the rising sign and the houses in suspense, without keeping the rest of the chart from speaking.

Good news: request a full copy of your birth certificate from the civil registry office that recorded your birth; the time is almost always set down there to the minute, and it is more reliable than family memory. Failing that, calculate for noon: your planetary positions stay accurate (only the Moon may change sign within the day), only the rising sign will stay uncertain as long as the time is missing. As for the place, your city is enough: no need to hunt for exact coordinates, a few kilometers do not shift a rising sign.

Recalculated every night, re-read at each transit

The almanac is regenerated every night: the moon of the day, the sky right now, the retrograde windows all come from the same engine, with fresh values. What you read on a Tuesday morning was recalculated for that Tuesday.

In the app, same discipline: your natal chart is calculated from your real birth data, then re-read at each transit. The reading can be soft and contemplative; the calculation that carries it keeps a watchmaker’s exactness.

Frequently asked questions

Why does the birth time matter so much?: Because the rising sign changes sign roughly every two hours, and the houses move with it. The planets, on the other hand, move slowly: a few minutes off, and their positions hold. So it is the rising sign that pays the price of a vague time, not the rest of the chart.
Could the positions differ from another site?: Between two serious sites, the planetary positions agree: the sky is the same for everyone. The small gaps you may see come down to display conventions: the time zone of the hours, the rounding of the degrees, the house system chosen. On the almanac, times are given in Paris time.
Are the site’s pages kept up to date?: Every night. The dated horoscopes, the lunar calendar and the sky’s events are recalculated from the ephemeris at each rebuild of the site: the values you read are today’s, not an archived snapshot.