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Abstract
In this work, Moon phases will be investigated as a computer application
in GIS. Moon phases depend on the position of moon and sun relative to the
earth observation points. All the works done before were concerning the
local view of the moon phaseaObjective of this study will be based; on the
following:
The concept of GIS and SDB, where the data measured to determine
the moon phases have features as spatial data and can be treated as
GIS.
The spatial data will be measured at any point on the surface of earth
(local view), but all the data models as well as queries will be handled
relative to the center of earth. The center of earth can be considered as
the global point of view for all the spatial data of the moon phases.
Therefore, a special transformation (direction cosine matrix) will be
used to transform from local view to global view and vise versa.
The moon and sun position modelling which have a lot of work done
during the history. The most recent model data will be used in this
work.
As a result of this work, we can overcome the difficulties due to the local
view. Crescent as one of the most critical moon phases is seen in some parts
of the earth, and not others. This is due to curvature of the earth. Therefore
in this thesis we will try to determine the locus of points on earth surface
which has the scene of the moon phases of the global view at earth center,
i.e. the locus of points at the local view which has the same scene of moon
phases as global view.