Moons of Uranus these five, Titania, is 1,578 km in diameter and the eighth-largest moon in the Solar System, and about one-twentieth the mass the Earth's Moon. The orbits of the regular moons are nearly coplanar with Uranus's equator, which is tilted 97.77° to its orbit. Uranus's irregular moons have elliptical and strongly inclined (mostly retrograde) orbits at large distances from the planet. William Herschel discovered the first two moons, Titania and Oberon, in 1787, and the other three ellipsoidal moons were discovered in 1851 by William Lassell (Ariel and Umbriel) and in 1948 by Gerard Kuiper (Miranda). These five have planetary mass,
Oberon (operating system) active Computer Science professors) referred to themselves as 'part-time programmers' in the book 'Project Oberon'. In late 2013, a couple of months before his 80th birthday, Niklaus Wirth published a second edition of Project Oberon. It details the implementation of the Oberon System using a RISC CPU of his own design realized on a Xilinx FPGA board. It was presented at the symposium organized for his 80th birthday at ETHZ. In the meantime several emulators for this version were implemented. According to Josef Templ, a former member of the developer group at Eidgenössische Technische Hochschule, Zürich and later member of