Abstract: A spacecraft system is provided, including a measurement device configured to measure information associated with position of a spacecraft, a filter configured to process the measured information and to provide estimated pre-maneuver information associated with position of the spacecraft and estimated post-maneuver information associated with position of the spacecraft, a propagator configured to predict post-maneuver information associated with position of the spacecraft based upon the estimated pre-maneuver information associated with position of the spacecraft and a model of a maneuver of the spacecraft, an error calculator configured to calculate an acceleration error based upon the estimated post-maneuver information associated with position of the spacecraft and the predicted post-maneuver information associated with position of the spacecraft, and a maneuver archive configured to store the acceleration error for updating the model of the maneuver.

Abstract: A navigation manager component cooperable with a user interface renderer is described. The navigation manager manages one or more navigation units and maintains a navigation unit cursor. Each navigation unit is associated with another navigation unit managed by the same navigation manager. The navigation manager provides a range of navigation services, which operate upon the navigation unit cursor. These services include a service to navigate forwards and a service to navigate backwards. These services take into account the associations between navigation units in order to determine the correct sequence of navigation units for forwards and backwards navigation. The services also determine whether the items represented by each navigation unit include eligible items or items for which data entry is incomplete. In this way, navigation units for which all the items represented by the navigation unit are ineligible can be passed over by the navigation services, to that they never become current.

Abstract: A razor for trimming and shaping of beards, mustaches, sideburns and the like is disclosed. The razor comprises an elongated handle, a tapered offset neck on one end of the handle and a razor head pivotally attached to the neck by a ball and socket joint interposed therebetween. A pivot lock locks the razor head in a desired attitude with respect to the handle and is controllable from the neck of the razor. The razor head carries a blade having opposed arcuate cutting edges, marginal edges of which extend from opposed arcuate surfaces of the razor head. The ball of the ball and socket is a center-cut ball presenting a path therethrough. The pivot lock is slidable into the center path of the ball to expand the ball, thus, locking the razor head in a fixed attitude to the handle of the razor.