From an article by Adam Hart-Davis in Science Magazine:
Should you be in the area:. . . a group of intellectuals in the English Midlands who, around 1765, began to come together regularly to discuss what they called natural philosophy--everything from the latest design of steam engines to the new gases that were being discovered by Priestley, Lavoisier, and others. They would meet for dinner and argue on into the night before climbing on their horses to ride home. And because they wanted to be able to see their way, they chose to meet each month on the Sunday nearest to the full moon--which was why they called themselves the Lunar Society of Birmingham, or the Lunaticks.
Another site has this document on the influence of Joseph Priestly and other Lunaticks on education in Birmingham.Monday October 17th 19:30 LUNATICK ASTRONOMY
By Andrew Lound - The Planetary Society
Venue: Sutton Coldfield, National Trust, Sutton Coldfield Town Hall, Sutton Coldfield.
Contact: Contact: Mrs. B. Millward tel: 0121 354 6446
The Lunar Society was one of the most influential groups in the 18th century, no aspect of science and industry was overlooked at their monthly dinner parties. Although the development of the steam engine and coinage production became the main focus for Matthew Boulton, he had developed a passion for astronomy. Andrew Lound tells the story of the Lunar Society’s interests in astronomy based on new research that has revealed some surprising facts! A dramatic presentation especially extended for this evening is lavishly illustrated, accompanied by music and props, and presented with 18th century flair!
Suggested usage: Use this word for any group that congregates around the time of the full moon.
The galaxy hunters felt the members of the Lunatick Society were crazy to observe the skies during the full moon, since its light washed out the faint treasures they sought.