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Chuck,

The values I got were:

Average watch time of observation: 00:15:29
Ds, average sextant distance: 37� 43.2.

Reduced to that time, Venus above horizon: 7� 8.'7.
Moon's lower limb above horizon: 44� 17.'6.

From table 1, adjustments for dip and semidiameter were -3.'1 and +11.'9 for
Venus and the moon, respectively.

Sa, apparent altitude of Venus: 7� 5.'6.
Ma, apparent altitude of moon's center: 44� 29.'5.

From table 2, moon's refraction and parallax: 38.'32.
From table 3, Venus' refraction and parallax: 7.'21.
From table 4, moon's augmented semidiameter: 15.'17.

D, the cleared distance: 38� 42.'9.

D1, distance at 00 hours: 38� 34.'8.
D2, distance at 01 hour: 39� 2.'3.

GMT per observation: 00:17:40, March 19th.

You may get slightly different average values by graphing than I get by
arithmetic. For proportioning, if you use a calculator to proportion the
altitudes to the average time of the distances, and to find the GMT that fits
the distance, you should get the same degree of accuracy I get with tables 7
and 8.

It's quite possible I've made a mistake somewhere. I double check as I go
along, but still make mistakes sometimes.

More after breakfast.

Bruce

   

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