My paper work/owners manual states 1969
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How much do they cost? Price starts at US$ 65,000 for a standard J model, and the X model (which is the very high performance, heavily customized version) starts at US$ 81,000. Because each Seabreacher is custom built to order, we can accomodate almost any special requests, from intricate airbrushed paint schemes to personalized interior treatments.
A proportional model of a three dimensional object is an scale model.
The following types of calculators are prohibited:calculators with built-in computer algebra systems Prohibited calculators in this category include:Texas Instruments: All model numbers that begin with TI-89 or TI-92 and the TI-Nspire CAS-Note: The TI-Nspire (non-CAS) is permitted.Hewlett-Packard: HP 48GII and all model numbers that begin with HP 40G, HP 49G, or HP 50GCasio: Algebra fx 2.0, ClassPad 300 and ClassPad 330, and all model numbers that begin with CFX-9970G
the answer is scale model
The modern theory is the one devised by Johannes Kepler. It uses the heliocentric idea, as Copernicus's model did, but Kepler rejected the circles and epicycles used by Copernicus and Ptolemy before him, and used elliptical orbits for the planets instead. Kepler's model was published in 1609, and it was realised quite quickly that it represented the movements of the planets more accurately than the old models. But the old models were not bad and their inaccuracies were demonstrated only after Tycho Brahe built new, accurate measuring systems in the late 1500s. Kepler used Tycho's observations. With 3 systems in play that were all reasonably accurate there was no way of deciding the best one, although Kepler's model was slightly better. But in the late 1600s Isaac Newton had built on previous work to produce the law of gravity and the laws of motion. He was able to show that a planet in the Sun's gravity field must move in an elliptical orbit. This was the clincher that made people accept Kepler's model.