3 ms·

How rare is it?

• IAmGraydon 2y ago
  That’s not really possible to exactly answer as it depends upon how tightly they are aligned. The last occurrence was March 10, 1982, and they aligned in a 95 degree arc. This degree of alignment will happen once every 175 years on average. However, an alignment within 4 degrees, for example, would occur every 400 billion years. In other words, never because the sun is expected to only last another 6 billion years.