An astronomy ‘experiment’ composed of three parts is described in the article. Being given necessary
data a simple model of inner planets of the solar system is made in the first part with planets’
circular orbits using appropriate scale. In the second part revolution of the figurines used as
model representations of the planets along their orbits is observed. In the third part of activity
apparent motion of Venus with respect to the observer on the Earth is studied. In the second part of
the paper problems are given, which relate to experimental activities and are designed to test if
learning outcomes of the experiment have been achieved: if correlation between orbital radius and
orbital velocity has been perceived, concepts related to motion of Venus as observed from the Earth
have been acquired and periodicity recognized. Described astronomy ‘experiment’ was one of the three
science experiments given to 11 and 12 years old students prior to Slovene science competition in
2017…