Lerner, K. Lee. World of earth science. Thomson-Gale, 2003 — 487-bet. ISBN 0-7876-9332-4. OCLC60695883. „Although these distances seem counterintuitive to residents of the Northern Hemisphere who experience summer in July and winter in January — the seasons are not nearly as greatly affected by distance as they are by changes in solar illumination caused by the fact that Earth’s polar axis is inclined 23.5 degrees from the perpendicular to the ecliptic (the plane of the solar system through or near which most of the planet’s orbits travel) and because the Earth exhibits parallelism (currently toward Polaris, the North Star) as it revolves about the Sun.“
worldcat.org
Lerner, K. Lee. World of earth science. Thomson-Gale, 2003 — 487-bet. ISBN 0-7876-9332-4. OCLC60695883. „Although these distances seem counterintuitive to residents of the Northern Hemisphere who experience summer in July and winter in January — the seasons are not nearly as greatly affected by distance as they are by changes in solar illumination caused by the fact that Earth’s polar axis is inclined 23.5 degrees from the perpendicular to the ecliptic (the plane of the solar system through or near which most of the planet’s orbits travel) and because the Earth exhibits parallelism (currently toward Polaris, the North Star) as it revolves about the Sun.“
