The ability of a navigation or positioning system toĭefine an exact location in relation to a coordinate system.Ībsolute gain. Pertaining to measurement relative to a universal constant or natural datum.Ībsolute accuracy. The horizontal coordinate of a set of rectangular coordinates.Īlso used in a similar sense in connection with oblique coordinates.Ībsolute. A squall frequent from May through August between Caboĭe Sao Tome and Cabo Frio on the coast of Brazil.Ībrupt. Rubbing or wearing away, or the result of such action.Ībroholos. Wasting of snow or ice by melting or evaporation.Ībrasion. This is termed chromatic aberration, and is practically eliminated over a moderate range of wavelengths by using a composite lens, called an achromatic lens, composed of parts having different dispersive powers.Īberration constant. Aberration may also result from differences in the wavelengths of light of different colors: light of the shorter wavelengths (violet end of the spectrum) comes to a focus nearer the lens than light of the longer wavelengths (red end of the spectrum). A lens so corrected is called an aplanatic lens. This is termed spherical aberration and, being due to the faulty figure of the lens, is eliminated by correcting that figure. In a single lens having spherical surfaces, aberration may be caused by differences in the focal lengths of the various parts of the lens: rays passing through the outer part of the lens come to a focus nearer the lens than do rays passing through its central part. The convergence to different foci, by a lens or mirror, of parallel rays of light. The aberration due to the motion of the center of mass of the solar system in space is termed secular aberration but is not taken into account in practical astronomy. The aberration due to the revolution of the earth about the sun is termed annual aberration. The aberration due to the rotation of the earth on its axis is termed diurnal aberration or daily aberration. When, in addition to the combined effect of the velocity of light and the motion of the earth, account is taken of the motion of the celestial body in space during the interval that the light is traveling to the earth from the luminous body, as in the case of planets, the phenomenon is termed planetary aberration.
The apparent displacement of a celestial body in the direction of motion of the earth in its orbit caused by the motion of the earth combined with the finite velocity of light. In a line approximately at right angle to the ship’s keel opposite the waist or middle part of a ship.
The unit of current in the centimeter gram-second electromagnetic system. Any direction between broad on the beam and astern. See also ABAFT THE BEAM, AFT, ASTERN.Ībaft the beam. In a direction farther aft in a ship than a specified reference position, such as abaft the mast. No hidden fees or costs associated.Abaft. Get access to our best prices, and cancel at any time without penalty. Message us at with the subject line "Skip the Month" and tell us your email. Unlocks our best prices, membership perks and giveaways. Three reasons to join:Įach month, you'll be charged $15.95 for your Items must be in new, unused condition with original packaging. If for any reason you are not content with your order, we gladly accept returns and exchanges orders within Get access to priority shipping on all orders (worth $19.95) on our store at no extra charge at all
#FREE NAVIGATOR GLOW IN DARK MOONLIGHT PENDANT PLUS#
Membership is just $15.95 a month When You join, you get access to:Įach month, you’ll receive exclusive discounted membership prices on all our full-priced items, plus early access and membership only catalogs. UPDATE: Due to huge demand we are officially running low on this product, please place your order while supplies last. so you can charge it up again in a matter of seconds when the glow wears out. For easy to use, you can charge by your smart phone app "flashlight". When fully charged it will glow brightly for the first 40 minutes and after that it fades out slowly in the following hours. Please note in order to get the best glow from your necklace, direct sun light or putting the necklace under a light source (UV flashlight, white bulb etc) should get you a beautiful glow. The pendant material is made of alloy come with a hypoallergenic chain, Lead-Free & Nickle-Free.
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