Astronomy Review So Far…

For Astro Check 2If I were you…I’d have all my

worksheets out as well as some paper to write on

(and maybe even study…)

ScalingA model earth is 8 cm in diameter. Calculate:• the diameter of the model moon

(e ÷ 4 = m; 8 ÷ 4 = 2 cm)• the diameter of the model sun

(e x 109 = s; 8 x 109 = 872 cm)• the distance between the earth and moon

(30 x e = e to m; 30 x 8 = 240 cm)• the distance between the earth and sun

(12,000 x e = e to s; 12,000 x 8 = 96,000 cm)

SEM SystemDraw and describe the specific motions within the

Sun-Earth-Moon system that cause:• day and night on earth(earth’s rotation: face sun = day; face away = night)• one year on earth

(earth’s revolution / orbit around sun)• eclipses of the sun (solar) and moon (lunar)

(moon’s revolution / orbit around earth)• an approximate month on earth

(moon’s revolution / orbit around earth)

Moon PhasesDescribe what causes moon phases.

(as the moon orbits earth, we see a different portion of the lit up side of the moon)

Draw the position of the sun, earth and moon during these moon phases:

Identify the moon phase(s) during which an eclipse may occur.

(solar eclipse = new; lunar eclipse = full)

SEASONS• Revolution and Earth’s tilt

are responsible for seasons

• Winter shadows are longer than summer shadows - in winter the sun stays closer to the horizon because the NH is tilted away from the sun and receives indirect light, also making it cooler

Spring

Summer Winter

Fall

ModelsExplain the pros (realistic) and cons (unrealistic) of the following labs / models: • modeling the motions of the SEM system

(P: see from perspectives; C: objects / space)• scaling the solar system

(P: relative size / distance; C: objects / space)• moon phase lab(s) – on yellow board or in hand

(P: moon orbit /phases; C: sun moved / moon shaded)