Cornelsen Experimenta 31115 Tellurium

Sun, earth, moon

The three-dimensional model, the Tellurium N, is very popular in teaching. It is used to illustrate numerous appearances in our solar system much more clearly than with any other model.
A tellurium (Latin tellus, the earth) is a device for demonstrating the movements of the earth and the moon. These celestial bodies rotate on a lever arm around a light source representing the sun.
Special feature - Horizon disk with shadow figure
This shadow figure on the horizon disc helps your students to find their own reference point on the earth. This gives them a better idea of the relationship between the sun, the earth and the moon.
Accompanying material
The comprehensive manual is part of the product and contains

Instructions for handling each part
Concrete lessons for working with the Tellurium

The units are suitable for working with pupils of classes 4 to 8, i.e. for primary and secondary school.
Included in delivery
Large earth globe (15 cm Ø)
Horizon disk with shadow figure
Satellite bar
Mains adaptor
Replacement bulb (low-pressure halogen lamp)
Felt tip pen, wipe
The Fresnel lens

For creating an extremely bright, parallel light bundle
For full radiation of the earth's globe and
To focus a light point on the globe to represent the apparent hike of the sun between the turning circles.

This short-focal Fresnel lens provides a directed (parallel) light. This means that a full half of the globe is exposed to the sun and the light limits (day and night) are in line with the natural ones.

The Fresnel lens can be placed on the Tellurium arm in three positions:

Day and night, seasons: Half of the Earth's globe is fully illuminated and the shadow boundary is clearly visible around the globe.
Sun Point, Inverters: The lens creates a spot with a small "courtyard" at the center of the globe. When the earth is rotated around the sun, the point of light travels across the equator between the northern and southern turning circle.
Moon phase: The moon is illuminated. As the moon moves around the earth, the phases of the moon and the darkness can be clearly demonstrated.


The satellite rod

In order to demonstrate the position and movement of a geostationary satellite, a rod can be placed with a "satellite" at the top on the shadow figure of the horizon disc.

Horizon disk with shadow figure

Can be placed self-adhesive at any place of the world of earth
For demonstrating the changing lighting situations on the earth

Date disc and date pointer

The globe is mounted on a pointer that moves around the sun when the tellurium arm is rotated. Depending on the position of the hand, the earth's axis is turned toward or away (seasons).
The data for summer and winter solstice as well as day and night equals are particularly marked on the date pane.

Large earth globe with pole rod

On the large globe, the shadow limit and other details can be easily seen even from a distance.
Pole rod for demonstrating the Earth's position in space with the Earth's axis aligned to a fixed point (polar star).

This text is machine translated.