The sub-Earth point gives the amount of libration in longitude and latitude. The word comes from the Latin for "balance scale" (as does the name of the zodiac constellation Libra) and refers to the way such a scale tips up and down on alternating sides. When a month is compressed into 24 seconds, as it is in this animation, our changing view of the Moon makes it look like it's wobbling. Because of the tilt and shape of its orbit, we see the Moon from slightly different angles over the course of a month. The Moon always keeps the same face to us, but not exactly the same face. The pummeled, craggy landscape thrown into high relief at the terminator would be impossible to recreate in the computer without global terrain maps like those from LRO. This is especially evident in the long shadows cast near the terminator, or day-night line. Its laser altimeter ( LOLA) and camera ( LROC) are recording the rugged, airless lunar terrain in exceptional detail, making it possible to visualize the Moon with unprecedented fidelity. Lunar Reconnaissance Orbiter ( LRO) has been in orbit around the Moon since the summer of 2009. Until the end of 2018, the initial Dial-A-Moon image will be the frame from this animation for the current hour. The animation archived on this page shows the geocentric phase, libration, position angle of the axis, and apparent diameter of the Moon throughout the year 2018, at hourly intervals. The data in the table for the entire year can be downloaded as a JSON file or as a text file. Widen the court by 3'8", and use a uniform 23'9" three-point line.Click on the image to download a high-resolution version with labels for craters near the terminator. Widen the court by 2', and use a uniform 23' three-point line. If NBA players are so much quicker, larger, and more dynamic than college players, why are they playing on the same size court? And yet, the court dimensions don't change AT ALL. So it does make sense to expand the NBA 3-point line. NBA players are supposed to be bigger and stronger and faster than college players. And now this affects how the 3-point line must be laid out. NBA ball is a bit more explosive than college ball. NBA players are a bit stronger than college players, so the three-point line moves back a bit. That's fair.Ĭollege ball is a bit more explosive than high school ball, so the court gets 10 feet longer. Let me explain my concerns using the following information: Level of BasketballĬollege players are a bit stronger than high school players, so the three-point line moves back a foot. That's an even more extreme change than widening the court by a few feet. Yet they added a 3-point line in 1979, 30 years after the NBA was formed. Random: Here are NBA shooting averages from each part of the 3-point line: The only logical reason I can really think of is that the NBA wanted to encourage more 3-point attempts from the corners, rather than from the top of the key or from the wings. It makes little sense for part of the three-point line to be 21 inches closer than or further from another part of the same three-point line. This is one thing that's always bothered me about NBA courts. Widen the basketball court by 42 inches, then make the entire 3-point line exactly 23'9" from the hoop? Make the entire 3-point line exactly 22' from the hoop? The 3-point line would form a perfect arc, like in all other levels of basketball. The three-pointer gets progressively longer as you move toward the top of the arc.Įxample of 3-point line in different leagues. The shortest possible three-point shot, from the corner, is 22 feet from the hoop. The arc that intersects the straight lines is 23 feet, 9 inches from the basket. The straight lines are 3 feet inside each sideline and run from the baseline to just short of the free throw line extended. The NBA three-point line, however, is a three-part structure with two straight lines and an arc in the middle. At most levels of basketball, the three-point line is an arc, so three-point shots are the same distance no matter where you are on the court.
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