In the section touching upon instruments we are told that “with regard to the spectroscope, micrometer, and other astronomical ... will produce in some phenomena which are computed for Greenwich ...

IN a set of twelve diagrams issued under the above title, the author has supplied a convenience which has been wanted for some time past in the class-teaching of elementary science, thus removing ...

This extraordinary phenomenon, which occurs on December 21 each year, marks the beginning of the winter season and highlights the ancient Egyptians' advanced astronomical and architectural expertise.