Morning journal and courier., 1889-01-14
NExT WRDNEsDAY,s ECLIPSE.
Points for Ama ateur Astronomers ana

Photographers.
 The eclipse of the moon which will occur on the 16th inst will be visible generally over the United States, Europe, Africa, America and on the Atlantic and Pacific oceans. The whole eclipse will last nearly six hours, ot which the moon will be in the shadow for little more than three hours, divided into an entrance and exit of equal duration. The greatest obscuration will extend over about seven-tenths of the lunar diameter.
 For all places using the standard times of the seventy-Gfth, ninetieth, one hundred and fifth and one hundred and twentieth merldlans west of Greenwich, known respectively as eastern, central, mountain and Pacific times, computation of the times of the phases of the eclipse is easy. One has to remember only that these times are five, six, seven and eight hours respectively slow of Greenwich time, and that these quantities must be subtracted from the following Greenwich times. The moon will enter the penumbra on January 17 at 2h. Sim. 30s. 8. m.; will enter the shadow at 3h 59m. 12s; will reach the middle of the eclipse at 5h 29m. 42s.; will leave the shadow at 7h. Inn. 12s.; will leave the penumora at Sh. 21m. 42s. By this rule are figured out the times of the phases of the eslipse at any place, and these times will be indicated by all clocks correctly regulated to any of the standard times. Correctly regulated time pieces, therefore, may be depended on by people wishing to watch the eclipse.
 For New York city the moon will enter the penumbra or half shadow at Al minutes and 2S seconds past o'clock on the evening of January Is. It will enter the shadow at minutes and 10 seconds after Il o'clock the same night, and will reach the middle of the eclipse at B minutes and 40 seconds past midnight. This will be the period of the greatest obscuration. The moon will leave the shadow at minutes and 10 seconds past 2 o'clock a.m., and will leave the penumbra at 25 minutes and 40 seconds past o'clock, when the eclipse will end.
 The Philadelphians will be able to witness these various phases about 51a minutes earli- CT, while the Bostoniaus will have to wait little less than 12 minutes longer than the New Workers. The beginning of the eclipse may be seen in San Francisco as early as 6:27:52 on the evening of the 16th, while New Orleans will be able to catch it's first glimpse at S:37:16 pm. the same day.
 The eclipse will, of course be, plainly visl- ble to the naked eye, and will afford much amusement to the amateur photographer in asmuch as the sensitive plate of the camera can detect the loss of light much more readl- ly than the naked eye. The moon loses some of her light immediately on entering the penumbra, and this is hardly discernable to the naked eye. Formerly the greater ob- scuration was difficult to photograph on ac- count of the meagreness of the light on en- tering the shadow, but such improvements have been made in photography of late years that faint sources of light can now make i'm pressions, and all the phases of an eclipse are now photographed at the observatories. The exposure need be only very short one, the time for uncapping and recapplng the lens being sufficient.