<span>Navigational charts are used to navigate. Generally, they display current meteorological, hydrographic, and navigational conditions. These can also include lines of latitude and longitude, topographical information, locations of lighthouses or radio beacons, the location of underwater reefs, water depth, and even emergency alerts. They are imperative when plotting a safe course.</span>
As you go deeper in the Earth both temperature and pressure increases. Although the inner core is very hot, it is solid because it is experiencing very high pressure.
It is actually a simplified view of the earth's rotation because the tilt of the earth's axis with respect to the plane of the earth's orbit means that sometimes sunrise occurs slightly earlier or later along the same longitude.
