Perhaps you should try some spelling variations:
optical astronomy » nautical astronomy, spherical astronomy, positional astronomy
astronomy series » astronomy sergey, gastronomy services, astronomy survives
patrick moire » patrick moore, patrick mkie, patrick meir
moire optical » more optical, core optical, fibre optical

You may be able to get more results by adjusting your search query.

• Adding a wildcard symbol may retrieve word variants: the patrick moire optical astronomy series*.