例句與造句

1. The osculating elements would remain constant in the absence of perturbations.
2. However, real astronomical orbits experience perturbations that cause the osculating elements to evolve, sometimes very quickly.
3. Such element sets are known as osculating elements because they coincide with the actual orbit only at that moment.
4. For most bodies, the osculating elements are relatively close to the proper elements because precession and perturbation effects are relatively small ( see diagram ).
5. An osculating orbit and the object's position upon it can be fully described by the six standard Keplerian orbital elements ( "'osculating elements "'), which are easy to calculate as long as one knows the object's position and velocity relative to the central body.
6. It's difficult to find osculating elements in a sentence. 用osculating elements造句挺難的
7. In the particular set of coordinates exampled above, much of the time-dependence of the elements has been omitted as unknown or undetermined; for example, the element n allows an approximate time-dependence of the element M to be calculated, but the other elements and n itself are treated as constant, which represents a temporary approximation ( see Osculating elements ).
8. For example, orbital elements, especially osculating elements for minor planets, are routinely given with reference to two dates : first, relative to a recent epoch for all of the elements : but some of the data are dependent on a chosen coordinate system, and then it is usual to specify the coordinate system of a standard epoch which often is not the same as the epoch of the data.
9. Thus a particular coordinate system ( equinox and equator / ecliptic of a particular date, such as J2000.0 ) could be used forever, but a set of osculating elements for a particular epoch may only be ( approximately ) valid for a rather limited time, because osculating elements such as those exampled above do not show the effect of future perturbations which will change the values of the elements.
10. Thus a particular coordinate system ( equinox and equator / ecliptic of a particular date, such as J2000.0 ) could be used forever, but a set of osculating elements for a particular epoch may only be ( approximately ) valid for a rather limited time, because osculating elements such as those exampled above do not show the effect of future perturbations which will change the values of the elements.