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Äîêóìåíò âçÿò èç êýøà ïîèñêîâîé ìàøèíû. Àäðåñ îðèãèíàëüíîãî äîêóìåíòà : http://www.ipa.nw.ru/PAGE/FUNDAMENTAL/LSBSS/winample_guide/user52sz.htm
Äàòà èçìåíåíèÿ: Unknown
Äàòà èíäåêñèðîâàíèÿ: Sun Apr 10 03:35:56 2016
Êîäèðîâêà:
Ïîèñêîâûå ñëîâà: galactic collision

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III.9. Restrictions

User has possibility to impose some restriction(s) on the Results of calculation. If the results are not satisfying these restrictions, they are ignored and not displayed.

Possible set of restrictions depends on coordinates that were specified for planned run. The system keeps in memory those restrictions that were valid for the coordinates of the same type during their last calculation, if any. Therefore user should either discard any restrictions (mark No restrictions or change those which have been preserved since previous run, if necessary. The set of the quantities on which may be imposed restrictions in the next run are highlighted on marking Set restrictions. Therewith the restrictions retained since preceding run can be seen.

Quantities computed in different coordinate systems and their designations used when setting restrictions and for displaying Results of calculation are given in the columns of the next table.

Coordinates
rectangular	spherical
	equator	ecliptic	horizon
X Y Z dX/dt dY/dt dX/dt R r dR/dt v	R.A. Decl. Dist. d(R.A.)/dt d(Decl)/dt d(Dist)/dt r Phase V Elong.	Long Lat. Dist. d(Long)/dt d(Lat.)/dt d(Dist)/dt r Phase V Elong.	A h Dist. – – – r Phase V Elong.

In the table the following designation are used:

X,Y,Z	— rectangular coordinates (equatorial or ecliptic)
d /dt	— the symbol of derivative with respect to time (a day being the unit of time)
R	— distance of object from the origin of coordinate system = sqrt((X)²+(Y)²+(Z)²)
r	— distance from the Sun
v	— velocity of object with respect to the origin of coordinate system = sqrt((dX/dt)²+(dY/dt)²+(dZ/dt)²), expressed in km/s rather than in AU/day
R.A.	— right ascension
Decl.	— declination
Dist.	— topocentric (or geocentric) distance for spherical coordinates
Long.	— longitude
Lat.	— latitude
A	— azimuth
h	— altitude
Phase	— phase angle (is not defined for the Sun)
V	— apparent magnitude in V band (this quantity is not calculated for objects with numbers from –12 to 0)
Elong	— elongation of object from the Sun.

On each computed quantity Q one can impose restriction of the types

1) Q >= A, 2) Q <= B

at once or apart. To impose restriction on any quantity mark check box at the left of corresponding line and then click on the field where you want to introduce limitative value. Immediately after that the necessary format for given quantity will appear above the field along with the name of corresponding unit of measurement. There is no need to fill in unessential decimal places, type only essential value in corresponding place. Empty field means the lack of corresponding restriction.

If restrictions of the types 1) and 2) are specified at once and A is less or equal to B, then selection will contain all the ephemeris lines with quantity Q complying with restrictions A <= Q <= B, that is Q satisfies conjunction of conditions: A <= Q AND Q <= B.

If A > B, then selection will contain all lines with quantity Q complying with disjunction of conditions:

A <= Q OR Q <= B. E.g. to obtain selection of ephemeris lines with east or west elongations of some body from the Sun equal or greater than 100 degree it should introduce lower limit (at the left) as +100 and upper limit (at the right) as –100.

If several restrictions are placed on different quantities, than selected lines will comply with all imposed conditions, if any.

If it is desirable to avoid appearance of solitary ephemeris heading in case all ephemeris lines for some object do not meet imposed restrictions, mark button Reject solitary headings in the same line with button Set restrictions.

If some restrictions are imposed on the value of magnitude for objects with numbers from –12 to 0 or on phase angle for the Sun, they are ignored.