Why the pages all match
A page written from a date range has one fact to work with, and it is a fact shared by a twelfth of everybody alive. From there the only way to fill a page is with adjectives attached to the sign, so every writer reaches for the same short list and the results converge. Nothing dishonest has happened. The input was simply too thin to produce anything else. The reader is the one left short, having searched a specific date and received a description of a twelfth of the world.
The way out is to compute rather than look up. A date resolves to a position, the position sits in a named ten degree band, and the band has a ruler and a literature of its own. That gives you material that differs from one Cancer birthday to the next, which the sign label never can. It is also duller, which is probably why it stayed out of print.
The position on this date
Taking noon in each year from 1930 to 2035, the Sun on 18 July fell between roughly twenty five and twenty six and a half degrees of Cancer. The narrowness is not a coincidence. The calendar overshoots the orbit by close to six hours a year and a leap day corrects it, so a fixed date oscillates inside a band about a degree and a half wide instead of sliding through the sign.
Those degrees fall in the third face of Cancer, twenty to thirty. The Chaldean sequence gives it the Moon, which already rules the sign, and the triplicity scheme reads it through Pisces and gives it Jupiter. Both are conventions with long histories, and they differ, which is worth knowing before anyone presents either as the answer.
What the tradition attaches here
Under the Chaldean reading the closing degrees of Cancer are described as the most concentratedly lunar part of the sign, with the themes of memory, attachment and retreat undiluted by a second planet. Under the Pisces reading the same degrees are given a softer and less bounded cast. Both are interpretation, and neither predicts anything about a particular life.
That distinction matters more than it sounds. A position can be checked against an ephemeris by anyone. What a tradition reads into that position cannot be checked at all, only reported accurately, and reporting it accurately means naming the scheme it came from. A page that gives one ruler and no scheme has quietly turned a disputed convention into a fact.
What to do with your own details
The figures here are noon approximations across a century, which is the honest limit of what a page can say to everyone at once. Your own Sun sits at one specific degree, minute and second, set by your year, the hour of your birth and the longitude of the place.
The widget above works that out and also reports how far you were born from the nearest sign boundary. For 18 July that gap runs to roughly four days of Cancer, so the answer is settled, but seeing the margin stated is more use than being told to trust a printed range.
Questions people ask about this
Is 18 July definitely Cancer?
Yes. Every year sampled at noon between 1930 and 2035 gives Cancer, with about four days of the sign remaining. No birth hour changes it.
Why do birthday pages repeat each other?
Because most are written from the sign alone, and the sign is shared by a twelfth of the population. Without a computed position there is nothing specific left to write.
What is the solar degree on this date?
Around twenty five to twenty six and a half degrees of Cancer, depending on the year. The widget above returns your exact figure.
Which face or decan is that?
The third of Cancer, from twenty degrees to thirty. Chaldean tables give it the Moon and the triplicity scheme gives it Jupiter by way of Pisces.
Does the tradition say anything specific about these degrees?
It describes them as the most strongly lunar part of the sign under one scheme and the most Pisces coloured under the other. That is convention rather than measurement, and the schemes disagree.
What else would I need for a full chart?
The hour and the birthplace. Without them the Moon can only be narrowed to two likely signs and the ascendant and houses cannot be calculated.