The Milky Way Galaxy is about 100,000 Light Years across. Each light year is about 63,241 Astronomical Units. An Astronomical unit is the average distance between the Sun and â¦ the Earth, or about 93 million miles. Based on that math we form an equation.100,000x63,241=6,324,100,000 Astronomical units Thats exactly 5.881413 Ã 1017 or 588,141,200,000,000,000 miles.he Milky Way Galaxy is about 100,000 Light Years across. Each light year is about 63,241 Astronomical Units. An Astronomical unit is the average distance between the Sun and â¦ the Earth, or about 93 million miles. Based on that math we form an equation.
The maximum distance a deck joist can span between supports is determined by the joist's dimensions and species, as well as the spacing between joists. The closer the joists are to each other, the greater the distance they're able to span safely. Two-by-twelve Douglas Fir joists spaced 12 inches apart on center, for example, can span 20 feet, 7 inches, but the same joists spaced 24 inches part can only span 14 feet, 7 inches. Cantilever.
These are usually placed 16 inches from centers, except for floors which are to carry very heavy weights. In these the joists are frequently placed 12 inches from centers. To estimate them 12 inches from centers add 1 to the number of feet in length of one wall on which the joists are placed.For example, suppose a building is 32 feet long, and the joists are placed 12 inches from centers.We simply add 1 to 32, which makes 33 the number of joists required for one span.f the spans are unlike, then estimate each span separately. If the joists are placed 16 inches from centers, then multiply the length of wall by Â½ and add 1. This will give the required number. Thus if the wall is 32 feet long, then 32 x Â½ + 1 = 25, he number required for one span.