Anyway, I am guessing that the concept could be that when the earth's rotation is similar in direction to earth's orbiting around the sun, then the added up centrifugal force will be "singular" and less interference. That time, if you stand in the equator, you will be more lighter and "upright" (due to the combined centrifugal force). I'm not sure if that's how the egg balancing came about.
Today is Lichun and many of my friends are balancing their household eggs on the floor. They are posting their achievements on social media. I wanted to try that too in my HDB flat. However, I got no success in different location of the house. I guess I will need a "surface level" tool to spot which part of the flooring is truly flat.
It's fun to be able to balance eggs on flat surface but it has got nothing to do with celestial events. That's because the Earth's gravity is more influential to an egg than any other celestial forces. I think patience and luck are criteria for a successful egg balancing. Sigh.
What is fascinating is that for less dense matter like water, it is easily influenced by the moon's gravitational force (and Earth's centrifugal force) than denser matter like humans and eggs, hence the high and low tides. As for me, I don't feel lighter or taller during high tides.
I'll try again the egg balancing soon.
Good luck in your tries.
- Egg balancing by Wikipedia. Note that egg balancing on a nail is not possible unless superglue was used or super flat nail head and super duper amount of patience were involved (my opinion).
- It took 1 min 20 sec to balance an egg, and 3 min 40 sec for the second one. "How to balance or stand an egg during Li Chun " Youtube entry by Dian Miao Ling.