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Follow the Sun With a Hands-On Sundial Investigation

Making a sundial to track shadow movement throughout the day gives children a simple way to investigate Earth’s rotation, the Sun’s apparent path, and the changing length and direction of shadows. With a stick, a firm base, and regular observations, an ordinary sunny day becomes a practical science lesson.

The activity works well in a classroom, homeschool setting, or backyard. Australian learners can compare results from Darwin, Brisbane, Sydney, Melbourne, Perth, or Hobart and see how latitude, season, and local weather influence the pattern.

A sundial does not need to be a precise timepiece to be valuable. The real learning comes from predicting where a shadow will fall, recording what actually happens, and explaining why the shadow moves as the day progresses.

Why Shadows Move

A shadow forms when an object blocks light from the Sun. As Earth turns, the Sun appears to travel across the sky from east to west. The shadow cast by a vertical stick therefore changes direction and length throughout the day.

In Australia, the Sun is generally seen towards the northern part of the sky at midday. A simple upright gnomon, or shadow stick, will usually cast its shortest shadow towards the south around solar noon. Solar noon is the time when the Sun is highest, so it may not match 12 o’clock on a school clock.

The difference is useful for discussion. Daylight saving changes clock time in New South Wales, Victoria, Tasmania, South Australia, and the Australian Capital Territory, while Queensland, Western Australia, and the Northern Territory generally do not observe it. The shadow itself follows the Sun, not the time shown on a phone.

Gather Materials For A Clear Investigation

Choose a level outdoor area that receives direct sunlight for several hours. A paved courtyard, oval, or section of backyard is usually easier than grass because the markings will not be disturbed. Avoid spots near tall gum trees, buildings, or fences that create extra shade.

Useful supplies include:

For a classroom group that needs extra construction ideas, teachers may also explore hands-on learning resources to complement the sundial investigation. Select materials that are sturdy enough for repeated use and safe for the age group.

Build A Simple Shadow Clock

Push the stick upright into clay or secure it through a hole in a cardboard base. Check the angle from several directions so the gnomon is as vertical as possible. A leaning stick will still make a shadow, but the results will be harder to compare.

Place the sundial in its sunny location and mark the tip of the shadow at the starting time. Write the exact time beside the mark. Repeat at regular intervals, such as every 30 or 60 minutes, keeping the base in the same position.

For a basic demonstration, the base can remain unaligned and students can simply track movement. To create a more accurate horizontal sundial, align the dial with true north and angle the gnomon towards the celestial pole. In southern Australia, this means the gnomon points towards the southern sky at an angle related to the local latitude. Accuracy is less important than understanding the reason for the adjustment.

Record Changes Across The Day

Ask students to predict the next shadow position before each observation. They can draw an arrow showing the expected direction, then compare it with the measured result. This supports scientific thinking because learners make a claim and check it against evidence.

A simple recording routine keeps the activity manageable during recess, lunch, and the afternoon session. In everyday Australian school language, an “arvo” observation may be the most convenient one, especially when the morning timetable is busy.

Cloud cover may interrupt the investigation, particularly during a wet-season afternoon in Darwin or a cloudy winter day in Hobart. If the Sun disappears, students can record the interruption rather than treating it as a failed experiment. A second observation day can provide a useful comparison.

Read The Southern Hemisphere Pattern

Early in the morning and late in the afternoon, the shadow is long because the Sun sits low in the sky. Around solar noon, the shadow becomes shortest. Its direction also changes steadily, creating a curved trail of marks across the base or ground.

The exact pattern varies with season and location. A class in Perth may see a different shadow length from a class in Brisbane on the same date, while students in Melbourne and Darwin will experience noticeably different daylight conditions across the year.

If the activity is repeated near the winter or summer solstice, children can compare the height of the midday Sun. They can also investigate why a winter shadow is often longer than a summer shadow, even when the stick remains exactly the same height.

Link The Sundial To Classroom Learning

The investigation connects naturally with science outcomes involving Earth and space, observable patterns, and fair testing. Mathematics enters through measuring length, reading time, estimating intervals, and comparing data. Students can create a line graph showing shadow length at each observation time.

Literacy tasks can include a procedural text explaining how to build the sundial, a labelled diagram, or a short explanation using terms such as light source, gnomon, rotation, direction, and length. Younger children can use picture cards and oral descriptions, while older learners can calculate the rate of change between measurements.

Teachers can also connect the lesson to classification and careful observation. For example, students might sort their data by morning, midday, and afternoon, or classify observations by sunny, partly cloudy, and overcast conditions. A related sorting and classification activity can help younger learners practise grouping before they organise sundial results.

Extend The Investigation Beyond One Day

Once the class understands the basic pattern, students can compare a fixed outdoor sundial with a portable version. They may discover that moving the base changes every mark, which demonstrates why a real sundial must remain carefully positioned.

A useful extension is to compare sundial time with Australian Eastern, Central, or Western clock time. Learners can discuss time zones, daylight saving, and why a clock may show a different time from the Sun’s highest point. This turns a craft project into a meaningful geography and measurement lesson.

Students can design a decorated sundial using durable craft paper, natural materials, or painted symbols. The finished model can remain a visual reminder that careful observation, repeated measurements, and a little sunlight can reveal the movement of our planet.