04-08-2023, 12:05 PM
From the 2023 Air Almanac are examples of Eastern longitude problems. See the attached screen shot at the bottom herein.
Look at the examples for only Aries and Aldebaran.
In these cases you have to add an extra whole degree to the Ap longitude so that when comparing your DR longitude to your Ap longitude the LHA, when entering '249, results in a shorter intercept. Whereas in PeterB's example from Pub. No. 249 you are decreasing LHA by one degree which for the same reason of will give you a closer intercept.
For me the solution to understanding this was simply doing a reduction of PeterB's '249 attached page and plotting the LOP using a LHA of 112° (the correct method) and my "simple method" of using a LHA of 113°.
My intercept was way too long- 79' or so. I could've seen there was a "too long intercept" problem when comparing the uncorrected Hc to Ho in '249.
Ed
Look at the examples for only Aries and Aldebaran.
In these cases you have to add an extra whole degree to the Ap longitude so that when comparing your DR longitude to your Ap longitude the LHA, when entering '249, results in a shorter intercept. Whereas in PeterB's example from Pub. No. 249 you are decreasing LHA by one degree which for the same reason of will give you a closer intercept.
For me the solution to understanding this was simply doing a reduction of PeterB's '249 attached page and plotting the LOP using a LHA of 112° (the correct method) and my "simple method" of using a LHA of 113°.
My intercept was way too long- 79' or so. I could've seen there was a "too long intercept" problem when comparing the uncorrected Hc to Ho in '249.
Ed