NavList:

glapook wrote:

"Lining up the bottom edge of the
sun's image in the index mirror with the top edge of its inverted image
in the liquid gives you a lower limb observation."

This is something other advisors seem to have missed. Always line up the edges(limbs) of the sun's images. Trying to superimpose one on top of the other is more difficult and less accurate, though if you did get it right, you would not then have to apply a correction for semi-diameter.

I began practice 30 years ago using the reflection off the surface of a swimming pool on a calm day. It worked at night too with stars, and made identification of images easier, given the wide "field of view". I graduated to old sump oil in a roasting tin.

Bill Morris
Pukenui
New Zealand
----------------------------------------------------------------
NavList message boards and member settings: www.fer3.com/NavList
Members may optionally receive posts by email.
To cancel email delivery, send a message to NoMail[at]fer3.com
----------------------------------------------------------------