British astronomer (1837-1888) best remembered for having produced one of the earliest maps of Mars in 1867. ALS signed “Richard A. Proctor,” one page, 4.5 x 7, August 8, 1887. Handwritten letter to "the Editor of Harper's Weekly," in full: "The enclosed short article on 'The Solar Corona & the Sun Spots' may be regarded as equally suitable either shortly before or shortly after the eclipse of August 19th. As the news of eclipse observations comes in points such as I have touched on in this article will be of interest, I think, to many." In fine condition. This total solar eclipse was visible across Europe, Asia, and Japan.
This item is Pre-Certified by PSA/DNA
Buy a third-party letter of authenticity for
(inquire for price)
*This item has been pre-certified by a trusted third-party authentication service, and by placing a bid on this item, you agree to accept the opinion of this authentication service. If you wish to have an opinion rendered by a different authenticator of your choosing, you must do so prior to your placing of any bid. RR Auction is not responsible for differing opinions submitted 30 days after the date of the sale.
