Since the Moon's orbit centers on the Earth, rather than the Sun, it would be a little confusing to think of the Moon's orbit as a year. Instead, this cycle of the Moon orbiting the Earth is much closer to our calendar system of months. It takes 27.322 days (or 655.728 hours) for the Moon to orbit the Earth. If that number looks familiar, it's because the orbital period of the Moon is exactly the same as its rotational period.
A self-sealing stem bolt. Self-sealing stem bolts are a basic component of reverse-ratcheting routing planers. (DS9 episodes: Progress, Prophet Motive) They consist of 80% mixed duranium, aluminum, and steel alloys, 11% electrically modulated ceramic, and 9% thermally stabilized plastic.
Packing Arrangements. SINGLE PACKING. This is an economical seal for many applications. Single packing consists of a stack of packing at the top of the packing box supported by either a spring or gland follower. Spring packing can be accomplished by having the packing follower drawn against the bonnet to compress the spring. (This is a variation on the live loaded packing discussed later in this section.) Figures 19 and 20 show single packing arrangements for sliding stem and rotary valves. This type of packing is not adjustable. Springs are not available in all alloy materials.