The apps push it because in astrology the birth time is supposed to calculate your "rising sign" or ascendant, which supposedly affects your whole chart - so they need it to seem legit. That said, if you don't actually know your birth time, you've got options: some apps let you input it as unknown or give a range, and honestly most people either guess or leave it blank and still get readings. The thing is, even if you do enter something, these apps aren't pulling verified data - they're just running the numbers through an algorithm based on whatever you feed them, so whether you nail it down to the minute or just ballpark it, the accuracy question kind of stays the same.