In mathematics, 'correct' is binary — the result is either exact or not — so the relevant question is whether the answer matches the expected output of the formula. Use the Lunar Age Calculator to check against textbook answers, marking schemes, or peer calculations. Where the result is approximate (for example, an irrational number displayed to a set precision), the number of significant figures shown exceeds what is needed for CBSE, JEE, or university-level contexts.