What are years

It’s leap year time… so what are years, anyway? And what do they have to do with the supermassive black hole in the core of the Milky Way?

Why do some years have an extra leap day and what is it for?

- See also:

• Solar Eclipse on the Beach
• Star Trails in the North
• Sacred Moon
• Sunrise, Cape Sounion
• Images and Sounds of Saturn Storm
• Blue vampire Star caught sucking Red Giant’s gas
• Close-up of 'Bathurst Inlet' Rock by Mars Curiosity
• Orion Nebula as you've never seen it before

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