Jan Woltjer - astronomer - was born in 1891.
Jan Woltjer - astronomer - died in 1946.
Jan Woltjer was born in 1849.
Jan Woltjer died in 1917.
Lodewijk Woltjer was born in 1930.
Janus Woltjer has written: 'Lucretii Philosophia cum fontibus comparata'
John Smith - astronomer - was born in 1711.
William Selwyn - astronomer - was born in 1806.
Harold Johnson - astronomer - was born in 1921.
John Brinkley - astronomer - was born in 1763.
Charles Wolf - astronomer - was born in 1827.
Tom Johnson - astronomer - was born in 1923.
Samuel Herrick - astronomer - was born in 1911.