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Annular eclipse of the Sun by Phobos (Curiosity, 20 August 2013) Eclipse of the Sun by Phobos, the larger of the two moons of Mars, in real time (Curiosity, 20 August 2013) The two moons of Mars, Phobos and Deimos, are much smaller than Earth's Moon, greatly reducing the frequency of solar eclipses on that planet.
Transits of Phobos from the Mars Opportunity rover landing site Duration Earth time Duration (Local Solar time) Minim. separ. Phobos ang. diam. Sun ang. diam. Sun alt. prior set of transits occurred in late April 2003 – early May 2003: 7 March 2004 (02:46:25 – 02:46:54) 08 18 32 – 08 19 00 671" 779.2" 1230.7" 34.6° 8 March 2004
The main purpose of pngcrush is to reduce the size of the PNG IDAT data stream by trying various combinations of compression methods and delta filters. It can also be used for various manipulations of PNG images, such as changing the bit depth , removing unwanted ancillary chunks , or adding certain chunks including gAMA, tRNS, iCCP, and ...
According to its author, this program can often get higher compression than other optimizers by 5–10%. [3] It is possible to compress some inflated PNGs to a size below 1% of the original file. [4] PNGOUT was also available as a plug-in for the freeware image viewer IrfanView and can be enabled as an option when saving files.
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