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Passive calibration satellites are objects of known shape and size. [1] Examples include the Lincoln Calibration Sphere 1 developed by the MIT Lincoln Laboratory.These are generally solid or hollow spheres, since that shape will have the same cross-section regardless of viewing angle, though later passive satellites used wire grid designs. [2]
Direction determination refers to the ways in which a cardinal direction or compass point can be determined in navigation and wayfinding.The most direct method is using a compass (magnetic compass or gyrocompass), but indirect methods exist, based on the Sun path (unaided or by using a watch or sundial), the stars, and satellite navigation.
Floating-card compass with prismatic sight (bearing 220° through eyepiece). The marine hand compass, or hand bearing compass|hand-bearing compass as it is termed in nautical use, has been used by small-boat or inshore sailors since at least the 1920s to keep a running course or to record precise bearings to landmarks on shore in order to determine position via the resection technique.
The description boasts, "Carefully designed with your cats' well-being in mind, this Christmas Tree Cat Scratcher incorporates safe, non-toxic materials, and is tightly wrapped with high-quality ...
“How do you know we’re going to heaven?” she asks and her father replies, “We’ll both go?” Oaklynn presses her father further, asking, “I am going to heaven?”
Parts of the United States are seeing snow for the first time this winter. Here's at some photos of the areas impacted.
A lubber line, also known as a lubber's line, [1] [2] is a fixed line on a compass binnacle or radar plan position indicator display pointing towards the front of the ship or aircraft [3] and corresponding to the craft's centerline (being the customary direction of movement).
The basic fluxgate compass is a simple electromagnetic device that employs two or more small coils of wire around a core of highly permeable magnetic material, to directly sense the direction of the horizontal component of the Earth's magnetic field.