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## Rotation and revolution of Earth

Shadows are an indirect way to observe the rotation and revolution of Earth. (Location must be in LA thx）

State Your Hypothesis: Before starting, jot down how you think the shadow will change over the course of the day. A hypothesis is a tentative explanation for the phenomena observed. It should identify variables that can be tested through the experiment. For example: “If a shadow is observed [insert time of day], then the length of the shadow will be [insert length- shorter or longer]”. Hypothesis should contain independent variables (what you specifically change during the experiment) and dependent variables (what you are measuring in the experiment).

Things to Consider:
How will the length of the shadow change throughout the day?
How will the cardinal direction (north, south, east, west) in which the shadow points change throughout the day?

Conduct your experiment: Pick a location where you can see a flag pole, street light or some other immobile, vertical object. You will need to visit this location at least TWO to THREE TIMES on the SAME day. Some suggestions: Somewhere near your home or place of business.
Observation #1- in the morning before 10 am, sketch the object and where the shadow is pointing and its approximate length. Use colored pencils or pens for your sketch. Note the time of day, approximate length of shadow and the compass direction the shadow is pointing in your sketch.

Observation #2- around midday, revisit the same location. Sketch the placement of the new shadow on the same sketch. Note the time of day, direction , and approximate length. Use colored pencils or pens for your sketch. Note the time of day and the compass direction the shadow is pointing.

Observation #3, repeat in the late afternoon.

Alternative: You may take a picture instead of sketching it. After inserting the picture into the template provided, indicate the compass direction the shadow is pointing, length of shadow and the time of day. Do this three times ( morning, midday and afternoon).

Below your sketch, record the following field observation information:

Date
Location- City
Temperature
Wind- Note the direction from which the wind is blowing. For example, a Southeast wind is coming from the southeast and moving towards the Northwest.
Atmospheric Pressure
Humidity
You can find weather information from the Weather Channel, Weather Underground, your phone’s weather app or in the newspaper.

Reflection: This is where you explain what you observed. To earn maximum points, you should explain your observations in detail avoiding one sentence responses to each question. Some things to consider:

What did you notice?
How did the shadow change over the course of the day? Be specific. For example, in which cardinal direction was it pointing? How did the length change?
How did the results of this experiment vary from what you thought would happen (#1 above)? Was your hypothesis correct? If not, how might you refine it?
Explain why the shadow moved as observed.
How might the results change if we conducted this experiment again at the end of the semester?
How does this relate to our topic of Earth/Sun Relations?
You may wish to use this template for Environmental Observation #1 because it has a space to write your hypotheses.
Environmental Observation Template.docxPreview the document OR Environmental Observation Template.pdfPreview the document