Somehow we humans got the idea that the best moment to really meditate on an event—a birth, a marriage, a death, a battle, a coronation, an inauguration, anything good, terrible, romantic, auspicious, historic, or otherwise memorable—is when the Earth is back in the same position it was when the thing happened. This is astronomy at work. On anniversaries and birthdays, we are in the same place in relationship to the sun. However, the whole solar system is actually moving through the galaxy every 225 million years. So you’re kind of in the same place, but everything is also totally different.
