speculative fiction writers i am going to give you a really urgent piece of advice: don't say numbers. don't give your readers any numbers. how heavy is the sword? lots. how old is that city? plenty. how big is the fort? massive. how fast is the spaceship? not very, it's secondhand.
the minute you say a number your readers can check your math and you cannot do math better than your most autistic critic. i guarantee. don't let your readers do any math. when did something happen? awhile ago. how many bullets can that gun fire? trick question, it shoots lasers, and it shoots em HARD.
you are lying to people for fun. if you let them do math at you the lie collapses and it's no fun anymore.
YOU GET IT
One of my favorite sci-fi writers put numbers on the mass and dimensions of his story's space-warships but got mixed up and wound up making them canonically less dense than smoke. After someone pointed that out, he stopped mentioning dimensions (since mass is more important to spaceships than size, anyway). Then some fans consulted with him and built a spreadsheet that calculates ship dimensions based on mass and hull-shape and he retconned the old dimensions in an event known in the fandom as "The Great Resizing".
These fans (specifically Joe Buckley, yes, that Joe Buckley) also gifted him a program that automatically calculates intercepts.
Okay, that might need clarification. In Honor Harrington, we routinely hear characters calling out time to intercept. A ship at point X, with initial velocity A, acceleration of B, and top speed of C, all on the way to point Y. They’ll call out both a least-time intercept (lay on the gas and don’t stop) and the zero-zero intercept (ending stationary and adjacent to Point Y).
Weber was calculating these by hand.






















