Lunar eclipse on Guide

Masaki Kouda Jun 21, 2000

Hi Guiders.

I found little mystery about lunar eclipse of 16 July.

Astronomical Ephemeris tells as :
Prnumbra enterd : 10h46m4 (UT)
Umbra entered : 11h57m0
Totality begins : 13h01m8

Guide's [Tables] -> [Lunar eclipses] tells as :
Prnumbra enterd : 10h47m (UT)
Umbra entered : 11h56m
Totality begins : 13h01m

I displayed lunar eclipse on Guide Lebel-12, animating 5-sec steps.
Prnumbra enterd : 10h51m20s (UT)
Umbra entered : 12h00m20s
Totality begins : 13h04m50s

It seems Earth's shadow is little small.
I turned lunar displaying 'Bitmap' to 'Shaded' .
I found Guide has 8 steps Penumbra.
And no--8 Penumbra is edge of Umbra Astronomical Ephemeris use to
calculate.

Masaki Kouda