| | | September 23 Melting Exomoon and Tabby's Star? | | | |
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 | | Artist’s concept of a hypothetical uneven ring of dust causing the mysterious dimming of Tabby’s Star. Image via NASA/JPL-Caltech. | | |
| Could a melting exomoon explain Tabby's Star? | | This star undergoes a long-term dimming that's so mysterious it was, at one time, proposed as possible evidence of an alien culture. Now, scientists say, a disk of debris - torn from a melting exomoon - might explain Tabby's Star. Read more. | | | | | | | | | |
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|  | | Equinox sun is over Earth's equator | This illustration by Tau'olunga via Wikimedia Commons shows the day arc of the sun, every hour - during the equinoxes - as seen on the celestial dome from the equator. Also showing twilight suns down to -18° latitude. Note the sun at the zenith at noon and that the tree's shadow is cast straight down. That is - as seen from the equator on the day of an equinox - a tree stands in the center of its own shadow. Read more. | | | | | |
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 | | A new season dawns | View at EarthSky Community Photos. | First sunrise of autumn - today's sunrise - from our friend Dr Ski in the Philippines. He wrote: "Of course, in the jungle, there is no autumn. We only have 2 seasons here: Monsoon Season and Not-Monsoon Season." Thanks, Dr Ski! Read more about the equinox. | | |
