"Oh wow. Okay."

"I still don't really get how you could have seasons without it."

"The sun hits more or less directly on various parts of the sphere depending on how it tilts in its progress around the sun, and the tilt changes throughout the year. The equator has no seasons because the sunlight is equally direct at all times and the poles have weird seasons because their tilt situation is also unusual. Seasons north of and south of the equator are opposites."

"That's so weird.  Doesn't that make it hard to keep track of things?  And it's the same with your days and nights, isn't it; half the world is offset from each other all the time - or, wait, it's not even that because it would all be continuous - how does that work, societally - "

"We have things called time zones within which it is conventionally the same numerical time, though exact sunrise and sunset may differ by locality within a time zone just as they might depending on whether you're up a mountain or down a valley. There are twenty-four time zones so at any given moment twenty-four times are represented on Earth, modulo greebles."

"Why twenty-four?"

"Twenty-four hours in a day."

"We have, uh, thirty-two."

...clock app up on computer. "This timing for seconds look right?"

She watches.  "Bit slow, I think."

"And is it sixty seconds to a minute sixty minutes to an hour?"

"No.  Sixty-four, for both."

"Gosh. I don't know that any of this timekeeping and astronomy stuff is going to be that relevant - I guess the stars are very relevant - but it's certainly interesting how deeply weird you can make two universes to each other and still both have Roman Empires and have mutually intelligible conversations."

"It really is.  - When did Rome turn into whatever other place you said, in your world; maybe we just haven't gotten there yet."

"In the like three hundreds or four hundreds, common era, though the Eastern chunk also known as the Byzantine empire persisted a bit longer. ...which is to say after the ostensible birth of Jesus Christ."

"It's year 785 for us right now.  Not - thirty-something."

"Well in my world it's 2157 so we sure know that doesn't match, is yours also counting from Jesus?"

"No, ours is from the founding of Rome - if it were from Jesus it would be thirty-something, is what I meant."

"...is Jesus, uh, around?"

"Yes!  Why does he get years numbered after him in your world???"

"Why do you know who he is if he doesn't seem like a year-numbering sorta guy??"

"He's like, moderately famous?  Does activism and philosophy and stuff?  He's a spring equinox guy; they're all kind of like that . . ."

"So not a religious leader particularly?"

"Well, a spiritual one . . ."

"What... is his spiritual teaching like."