Betula pendula grown for forest products such as lumber and pulp, as well as for aesthetic purposes and ecosystem services. It is sometimes used as a pioneer and nurse tree elsewhere. Silver birch wood is pale in colour with no distinct heartwood and is used in making furniture, plywood, veneers, parquet blocks, skis, kitchen utensils and in turnery. It makes a good firewood that produces a good heat when burnt but is quickly consumed by the flames. Slabs of bark are used for making roof shingles and strips are used for handicrafts such as wooden footwear and small containers. Historically, the bark
Northern celestial hemisphere referred to as the Northern Hemisphere. For the purpose of celestial mapping, astronomers may conceive the sky as the inside of a sphere divided into two halves by the celestial equator. The Northern Sky or Northern Hemisphere is therefore the half of the celestial sphere that is north of the celestial equator. Even if this geocentric model is the ideal projection of the terrestrial equator onto the imaginary celestial sphere, the northern and southern celestial hemispheres is not to be confused with descriptions of the terrestrial hemispheres of Earth itself. Northern celestial hemisphere The northern celestial hemisphere, also called the