Quote: I love questions! I'm not always clear when I type.
Yes, large end up, which is the correct incubating position as well. Some eggs are difficult to tell which end is which; technically the large end is more porous which is why air is pulled inward to help the embryo develop. If you set an egg on its side, the large end will be slightly higher than the other end.
THe embryo gets oriented based on the end up the highest during the first week and by the beginning of the second week, it has it's head up toward the air cell, and bum and feet curving downward like a C. THen it can internally pip by pushing upward thru the membrane into the area of the air cell.
Does this make sense? Maybe you already knew this.