The first day of spring, also known as the Vernal Equinox, is fast approaching and going hand-in-hand with the beginning of spring are commonly held myths.
One such belief is that the length of daylight is equal to the length of darkness on the Vernal Equinox. The truth of the matter is that there are indeed days when the daylight and nighttime hours are equivalent, but the true days of equality do NOT occur during the Equinox. By the time the center of the sun passes over the Equator, the day will actually be slightly longer than the night no matter where you are on the globe. The difference in daylight hours is truly more a function of geometry and the Earth's atmosphere.
Our atmosphere will bend the sun's rays when the sun is close to the horizon, so the sun appears to be higher in the sky than it actually is and, consequently, seems to be above the horizon a few minutes earlier than it is. The end result is that the Vernal Equinox marks a day when daylight and nighttime hours are not of equal proportion, but, instead, the daylight hours are actually longer than the length of darkness.
Another and perhaps one of the most popular myths is that a person can balance an egg on its end only during the Vernal Equinox. Supposedly there is equal gravitational pull between the Earth and sun on this special day allowing this feat to be accomplished. But truth be told, there is nothing unique or special about the first day of spring such that anyone with a steady hand could balance an egg any day of the year.
The reason being is that there are small irregularities and very tiny bumps on the eggshell itself... so provided you had the "right" egg and some patience, you could, through trial and error, prop an egg on its end irregardless of what day of the year it is.
The bottom line, there are several myths and beliefs about the magical, mystical powers held by the first day of spring, but in actuality when it comes to eggs on this March 20th, it's just best to have them for breakfast and forget about using them in a balancing act.