Ninety seven against nine
A minority of nine years in a run of one hundred and six is small enough to be dismissed by anyone writing a fixed date range and large enough to matter a great deal if you happen to be in it. The Leo years are not scattered randomly; they fall where the drift of the ingress happens to run early.
That drift is a consequence of the calendar rather than anything astrological. A tropical year is about a quarter of a day longer than the year we count, so the instant the Sun reaches one hundred and twenty degrees of ecliptic longitude arrives roughly six hours later each year, then springs back some eighteen hours when February gains a day. Over ten years the boundary roams across about a day and a half of calendar time, and 22 July sits inside the early edge of that range.
Clock time and map position
Because the ingress is one worldwide instant, the calendar day it belongs to depends on where you were standing. An entry into Leo at 02:00 UTC on 23 July is still ten in the evening on the twenty second in New York, so a birth at eleven that night in Manhattan is Leo while a birth at the same absolute moment in Madrid is Cancer.
Nearly every wrongly reported sun sign starts here. A date is copied from a certificate and matched to a table that silently assumed one particular time zone, and the birthplace never enters the calculation. Give the place and the hour and the disagreement disappears. The widget above does exactly that, and it also reports how many hours from the boundary the birth fell, which is the number that tells you how safe the answer is.
Why the cusp story does not hold
A Cancer Leo cusp is usually described as warmth turned outward, private feeling with a public face. Whatever the merits of that as a character sketch, it is not what the Sun is doing. At any second the Sun has one ecliptic longitude, and it is either under one hundred and twenty degrees or over. A birth an hour before the change is entirely Cancer and one an hour later entirely Leo, with no graded middle.
The word cusp is most accurate when read as a note about the record. It says that the year, the hour or the place was never supplied, and it retires as soon as they are. A placement close to the line is complete in itself, not a diluted version of the sign it falls in.
The two lights
Cancer is cardinal water ruled by the Moon and Leo is fixed fire ruled by the Sun. They are the only pair of neighbouring signs each governed by one of the two lights, and while that is not a shared ruler it does give them a common footing in the traditional scheme, where every other sign is assigned to a planet held in two places.
The contrast is otherwise real. Cardinal water is read as protective and indirect; fixed fire as visible and reluctant to change course. Where they are closer than the popular versions admit is in loyalty and in the seriousness both attach to family and to being needed. If your answer turns out to be the sign you did not expect, the practical loss is small. The Sun is one placement, and the Moon, the Ascendant and everything else in the chart sit precisely where they always did.
Questions people ask about this
Is 22 July Cancer or Leo?
Usually Cancer. At noon across the years from 1930 to 2035 the date gave Cancer in ninety seven years and Leo in nine, so the odds favour Cancer strongly without settling the matter.
How do I know if my year is one of the Leo ones?
They are the years where the ingress arrived before midday, following the four year leap pattern rather than appearing at random. The widget above computes your own year instead of asking you to match it to a list.
Does my birth hour matter on this date?
Yes, in the years where the boundary falls during 22 July itself. In those years a morning birth and a late evening birth on the same day give different signs.
Am I on the Cancer Leo cusp?
No, because the Sun does not occupy two signs at once. It sits at a single longitude, inside one sign, at every instant. Cusp describes a gap in what you were told rather than a blended placement.
Why do sources give different end dates for Cancer?
Because the true boundary moves and a printed range cannot. Publishers round it differently, and many ranges were originally computed for a time zone that has nothing to do with the reader.
If I turn out to be Leo, what else changes?
Only the sun sign. Every other placement, the Moon, the Ascendant, the planets and the houses, is calculated the same way and is unaffected by which side of the boundary the birth fell on.