Once every 25, 800 years, the sun lines up with the centre of our Milky Way galaxy on a winter solstice, the sun's lowest point in the horizon.
每过25 800年,在冬至日,太阳都将与银河系的中心重合,太阳的最低点在地平线上。
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In the new app, groups of blurry lines known as Gabor patches appear at several points across the screen and the user must identify when one appears in the centre.