Because the Earth is constantly moving, there is only one specific time each spring when the planet lines up precisely with the sun. And, interestingly, we say that March 20th is the day of the equinox, however this is according to Universal Coordinated Time, an agreed upon common time that is used all over the world.
If you are to celebrate the spring equinox collectively with the rest of the northern hemisphere and according to UCT time, the equinox will happen at 4:30 am on March 20th. But for us here in the Pacific Standard Timezone specifically, this means that we will technically be observing the equinox this year at 9:30 pm on March 19th because of varying time zones.
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