Astronomy

Free to read here, from Project Gutenberg.

The Story of the Heavens

Robert S. Ball

Pioneers of Science

Oliver Lodge, Sir, also an audiobook

A Popular History of Astronomy During the Nineteenth Century

Agnes M. Clerke, also an audiobook

Astronomy for Amateurs

Camille Flammarion

Myths and Marvels of Astronomy

Richard A. Proctor

The Astronomy of Milton's 'Paradise Lost'

Thomas Nathaniel Orchard

The Astronomy of the Bible

E. Walter Maunder

Curiosities of the Sky

Garrett Putman Serviss, also an audiobook

A Text-Book of Astronomy

George C. Comstock

The Martyrs of Science, or, The lives of Galileo, Tycho Brahe, and Kepler

David Brewster, also an audiobook

A Field Book of the Stars

William Tyler Olcott

History of Astronomy

George Forbes, also an audiobook

Astronomy of To-day: A Popular Introduction in Non-Technical Language

Cecil Goodrich Julius Dolmage

Recreations in Astronomy

Henry White Warren

The Story of Eclipses

George F. Chambers, also an audiobook

The gradual acceptance of the Copernican theory of the universe

Dorothy Stimson

Other Worlds

Garrett Putman Serviss

Half-hours with the Telescope

Richard A. Proctor

Side-Lights on Astronomy and Kindred Fields of Popular Science

Simon Newcomb

Lectures on Stellar Statistics

C. V. L. Charlier

The discovery of a world in the moone

John Wilkins

Are the Planets Inhabited?

E. Walter Maunder

Time and Tide: A Romance of the Moon

Robert S. Ball

Pleasures of the telescope

Garrett Putman Serviss

Sir William Herschel: His Life and Works

Edward S. Holden

The uses of astronomy

Edward Everett

Cosmografía

Amédée Guillemin

Spanish

Watchers of the Sky

Alfred Noyes

Astronomical Instruments and Accessories

William Gaertner and Company

The Future of Astronomy

Edward C. Pickering

Publications of the Astronomical Society of the Pacific, Volume 1

Astronomical Society of the Pacific

A Textbook of General Astronomy for Colleges and Scientific Schools

Charles A. Young

Le Système Solaire se mouvant

August Tischner

French

A New Astronomy

David P. Todd

An Introduction to Astronomy

Forest Ray Moulton

Scientific Papers by Sir George Howard Darwin. Volume V. Supplementary Volume

George Howard Darwin, Sir

Mathematical Geography

Willis E. Johnson

The Tides and Kindred Phenomena in the Solar System

George Howard Darwin, Sir