Meanings of green reading in English

Slowly over the years I've reread the volumes, and they seem like entirely different books from that first green reading.

Through its open window the head and shoulders of Mr. Stone could be seen close to a small green reading-lamp.

When asked what makes a good caddie, many caddies will erroneously cite technical advice, green reading, club selection or strategic advice.

The tall standard lamps were unlighted, and only the blazing fire and a small green reading-lamp made a spot of brightness.

His iconoclastic approach includes dunking golf balls in salted water to check for imperfections and also something called "vector green reading".