Leap Second
A which may be added or subtracted to adjust UTC at either, both, or neither, of two specific opportunities each ...
A which may be added or subtracted to adjust UTC at either, both, or neither, of two specific opportunities each ...
Every fourth year, in which a 366th day is added since the Earth's revolution takes 365 days 5 hr 49 ...
A disk-shaped galaxy that contains no conspicuous structure within the disk. Lenticular galaxies tend to look more like elliptical galaxies ...
A slight tipping and tilting of the Moon from week to week that brings various features along the limb into ...
Electromagnetic radiation in the neighborhood of 1 nanometer wavelength.
Light Pillars are an atmospheric phenomenon created by light which is reflected by ice crystals in the atmosphere.
A glow in the night sky or around your observing site caused by artificial light. It greatly reduces how many ...
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