It's definitely in the northern hemisphere and the sun rises in the East. The location of the equator hasn't been set in stone in any source. Most maps of Toril only go as far south as the Isle of Nimbral (if they even go that far!) but, if we take the map of the world from the 3.0e FRCS and compare it to Ed's original maps (before the lands got compressed in 3rd edition), the equator would roughly bisect Nimbral and run about 500 miles off the south coast of Chult, scraping the southern tip of Rethild and maybe touch upon southernmost Dambrath.
When life turns it's back on you...sneak attack for extra damage.
Thanks very much! I kept searching and adjusted my search terms and also found this: http://www.realmshelps.net/faerun/lore/life/land.shtml which indicated things got hotter and more arid farther south, which seemed to indicate the equator was at the south or off the south edge of the map of the Sword Coast. I'm just getting back into RPG after decades, and I'm new to the Forgotten Realms. So much to read! But I think I'm gonna like it here :D
Do you recall the old Forgotten Realms Atlas published ~ 1990 ?
On the introduction pages there is a picture showing in part the curvature of Toril.
Assuming such 1e details are still good, and if you are good with sphere formulas, probably you can calculate the full planet circumference and based on that where the equator might be located.