IT has been supposed that the difference between the zenith distance of a star obtained by direct observation and that obtained by observing it reflected in a pool of mercury—as it is not fully ...

Modern-age telescopes have offered us a tantalizing view of what lies in the vast expanse of space, while also giving us glimpses of the universe’s past. However, making telescopes that can peek deep ...

Large field spectrographs are severely influenced by atmospheric refraction. We discuss the effect of differential refraction across the field as well as the chromatic effects for the Norris ...

The familiar claim, “Nothing can go faster than light,” is, in fact, misleading. Light travels at different speeds in different media. The speed depends on the medium’s index of refraction (n). Light ...

PEOPLE engaged in radio tracking of space vehicles are well aware of the fact that the Earth's atmosphere may cause serious refractive errors in the elevation angle determination. It is also generally ...

Stephen has degrees in science (Physics major) and arts (English Literature and the History and Philosophy of Science), as well as a Graduate Diploma in Science Communication. Stephen has degrees in ...