Indeed they were.
Vermeer lived 1632-1675, Cassatt 1844-1926.
impressionist movement
She worked during the last part of the 19th centure, the period of Impressionism.
Johannes Brahms (1833 - 1897) was one of the leading composers of the Romantic period - a period of music generally seen as lasting between c. 1800 and c. 1910.
Beethoven and Johannes Brahms
Johannes Riedel has written: 'Music of the romantic period' -- subject(s): History and criticism, Music, Romanticism in music
The period of a planet is the time it takes for the planet to complete one orbit around its parent star. This period is typically measured in Earth days or years, depending on the length of the planet's orbit.
For instance the impressionists, as Monet, Renoir, Morisot. Also van Gogh and Gauguin.
Mary Cassatt died on June 14, 1926 at the age of 82.
Gravitation. See the answer to the question concerning Johannes Kepler's accomplishments.
The Printing Press - Johannes Gutenberg
C Monet, P-A Renoir, A Sisley, C Pissarro, Berthe Morisot, Mary Cassatt, G Caillebotte, E Degas, E Manet (for a short period), T Robinson. All French except the American Robinson. Cassatt, US-born, worked in France.
Johannes Kepler defined the periods of planets. He formulated the laws of planetary motion, including how a planet's period is related to its distance from the sun.