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To find the SHA (Right Ascension) of a star given the GHA (Greenwich Hour Angle) of Aries and the GHA of the star, you can use the following formula:

SHA of star = GHA of star - GHA of Aries

Here's how to use this formula step by step:

1. Identify the GHA of Aries from the Nautical Almanac for the date and time of your observation.
2. Measure or calculate the GHA of the star at the same time as the GHA of Aries.
3. Subtract the GHA of Aries from the GHA of the star.
4. If the result is negative, add 360 degrees to the result to obtain the correct SHA.

For example, suppose you are trying to find the SHA of the star Betelgeuse at 10:30 UTC on January 1, 2022. From the Nautical Almanac, you find that the GHA of Aries at that time is 100 degrees. You measure or calculate the GHA of Betelgeuse to be 150 degrees. Using the formula above, the SHA of Betelgeuse is:

SHA of Betelgeuse = GHA of Betelgeuse - GHA of Aries
SHA of Betelgeuse = 150 - 100
SHA of Betelgeuse = 50 degrees

Therefore, the SHA of Betelgeuse at 10:30 UTC on January 1, 2022 is 50 degrees.