Abstract: Methods for forming and using an educational kit are disclosed. The kit may be useful as an educational tool or toy for the exploration of mathematical concepts such as multiplication, exponents, and logarithms. Such a kit may include a set of at least three masses, each mass having a numerical label, wherein a first mass has a first numerical label and a first weight, a second mass has a second numerical label and a second weight, a third mass has a third numerical label and a third weight, a sum of the first weight and the second weight equals the third weight, and the first numerical label multiplied by the second numerical label equals the third numerical label.

Abstract: An electronically generated simultaneous display of the local time within multiple time zones in the world is adjusted to accommodate local time arising from Daylight Saving Time. A preferred modified south polar projection of the Earth which schematically depicts the Northern Hemisphere is divided into geographical time zones. Each geographic time zone is associated with a time marker that points to an adjacent time scale. Either the geographical time zones or the time markers are adjusted in order to correctly display the ongoing time changes resulting from the continuous observation of Daylight Saving Time in time zones of the world. As further features, a user may adjust the display to present a hypothetical time and the corresponding times experienced in different time zones around the world. A user may have a specific time zone highlighted by invoking data, such as a city name, a telephone area code or an address book contact reference, which is associated with specific time zone.

Abstract: An electronically generated simultaneous display of the local time within multiple time zones in the world is adjusted to accommodate local time arising from Daylight Saving Time. A preferred modified south polar projection of the Earth which schematically depicts the Northern Hemisphere is divided into geographical time zones. Each geographic time zone is associated with a time marker that points to an adjacent time scale. Either the geographical time zones or the time markers are adjusted in order to correctly display the ongoing time changes resulting from the continuous observation of Daylight Saving Time in time zones of the world. As further features, a user may adjust the display to present a hypothetical time and the corresponding times experienced in different time zones around the world. A user may have a specific time zone highlighted by invoking data, such as a city name, a telephone area code or an address book contact reference, which is associated with specific time zone.

Abstract: The present invention comprises an educational device for use with an earth globe having ecliptic angle of inclination for teaching students the position of the earth relative to the sun through the various seasons. The educational device can also be used to teach the months of the year as well as teaching the causes of night and day. The educational device having a flat board, which represents the earth's orbital plane, and having a sun label, a plurality of season labels and a plurality of month labels affixed on the facade of the board. The educational device also has a indexer wheel pivotally mounted to the board for rotatably mounting the earth globe so that the student may be able to freely rotatably maneuver the earth globe relative to the season labels so that the student can visually grasp the causes of the seasons as the year proceeds.

Abstract: The invention described herein is a mechanical device that appearing uncrowded with lines, numbers, and other markings, depicts the sun's daily path and gives sunlight information, for any interested latitude, date, and time.A major dial is rotated on a base according to the latitude; a sun-path slider is slid on the major dial according to the date. Then the device depicts a two-dimensional, elevation view of the sun's daily path, as a straight line, through all or some of these five zones in the sky: direct sunlight; civil, nautical, and astronomical twilights; and night.The depicted sun's daily path gives the following sunlight information: the directions and times of sunrise and sunset; the times of the beginnings and endings of the twilights. On the depicted sun's daily path, the sun's position, indicated by a sun-position slider according to the time, gives solar energy quantities and the sun's angular height on the base and the sun's direction on a minor dial.

Abstract: A globe, comprising: a stationary base; a day and night boundary ring mounted on the stationary base; an arm supported at its base end by the day and night boundary ring so as to be rotatable around a first axial line; and a spherical globe main body rotatably supported by a free end of the arm so as to be rotatable around its earth's axis; the first axial line defining the ecliptic angle with respect to a vertical line. According to this globe, the distribution of the regions of day and night in any time of the day and in any time of the year can be readily demonstrated by means of the day and night boundary ring simply by turning the globe body around the earth's axis and the first axial line, respectively, without using any complicated structure.