Annie Jump Cannon

Annie Jump Cannon was born in Delaware in 1863 and studied physics and astronomy at Wellesley College.

She later worked at the Harvard College Observatory, where astronomers were building enormous catalogs of stellar spectra.

Cannon became extraordinarily skilled at identifying patterns in stellar spectra and classifying stars quickly and consistently.

Her work contributed to the spectral sequence O, B, A, F, G, K, M that became a standard framework in astronomy.

When starlight is spread into a spectrum, dark and bright features reveal information about temperature and chemical elements.

Classification gave astronomers a way to organize stars based on observable physical characteristics rather than only brightness or position.

Cannon helped organize stellar spectra, while Cecilia Payne-Gaposchkin later used stellar physics to explain what those spectra revealed about temperature and composition.

Together, their stories create a strong historical chain from observation to classification to physical understanding.

As TransitSatellite expands into stars and the Galaxy, users will encounter stars with different colors, temperatures, sizes, and spectra.

Cannon's classification work provides an ideal historical foundation for explaining why those differences matter.

A large data collection becomes much more useful when patterns are recognized and categories make comparison possible.

Cannon's work shows how classification can turn overwhelming amounts of information into scientific understanding.