trust me, its not that easy

this was pretty mad. in the middle of the Earth the water goes straight down, no vortex. Belem, our guide, moved the sink+bucket only 2m to the left and then 2m to the right. You can see a vortex spinning clockwise then anticlockwise....honestly, I was quite fascinated by this and made her do it twice

how do?

solar clock....bout quarter to 4