A solar eclipse
The Sun-Earth-Moon System
Lesson 3
ECLIPSES AND TIDES P. 744 – 751
Eclipses • What is the large object in the photograph? – Earth.
• What is the dark spot? – A solar eclipse
• Solar eclipses only occur during 1 of the moon phases; which phase is that? – New moon phase
Shadows • Umbra: – Central, darker part of a shadow where light is totally blocked.
• Penumbra: – Lighter part of a shadow where light is partially blocked.
Solar Eclipse • Definition: – When the moon’s shadow appears on earth’s surface.
Solar Eclipse • Total solar eclipse: – When the moon covers the sun completely – Can only be seen from the moon’s umbra
Solar Eclipse • Partial solar eclipse: – The moon never completely covers up the sun – This can be seen from the moon’s penumbra
Why solar eclipses don’t occur every month • Moon’s orbit is slightly tilted compared to earth’s orbit.
Lunar eclipse • Definition: – Occurs when the moon moves through earth’s shadow.
Lunar eclipse
Lunar eclipse
Lunar eclipse • Total lunar eclipse: – When the moon moves through the earth’s umbra.
• Partial lunar eclipse: – When the moon moves through the earth’s penumbra.
Tides • Definition: – The daily rise and fall of sea level.
Tides • Tides are caused by the moon’s gravity
Tides
Spring and Neap tides • Spring tides: – Occur during full moon and new moon phases. – The sun and moon’s gravity combine, to produce higher high tides and lower low tides.
• Neap tides: – Occur a week after spring tide. – Sun reduces moon’s gravitational pull on the earth. – High tides are lower; low tides are higher.
Lesson 3
ECLIPSES AND TIDES P. 744 – 751
Eclipses • What is the large object in the photograph? – Earth.
• What is the dark spot? – A solar eclipse
• Solar eclipses only occur during 1 of the moon phases; which phase is that? – New moon phase
Shadows • Umbra: – Central, darker part of a shadow where light is totally blocked.
• Penumbra: – Lighter part of a shadow where light is partially blocked.
Solar Eclipse • Definition: – When the moon’s shadow appears on earth’s surface.
Solar Eclipse • Total solar eclipse: – When the moon covers the sun completely – Can only be seen from the moon’s umbra
Solar Eclipse • Partial solar eclipse: – The moon never completely covers up the sun – This can be seen from the moon’s penumbra
Why solar eclipses don’t occur every month • Moon’s orbit is slightly tilted compared to earth’s orbit.
Lunar eclipse • Definition: – Occurs when the moon moves through earth’s shadow.
Lunar eclipse
Lunar eclipse
Lunar eclipse • Total lunar eclipse: – When the moon moves through the earth’s umbra.
• Partial lunar eclipse: – When the moon moves through the earth’s penumbra.
Tides • Definition: – The daily rise and fall of sea level.
Tides • Tides are caused by the moon’s gravity
Tides
Spring and Neap tides • Spring tides: – Occur during full moon and new moon phases. – The sun and moon’s gravity combine, to produce higher high tides and lower low tides.
• Neap tides: – Occur a week after spring tide. – Sun reduces moon’s gravitational pull on the earth. – High tides are lower; low tides are higher.
