Tempe is an astral representative of the Great White Brotherhood. As his name suggests, he exists outside of time and possesses powers of prediction and foresight. As a member of the Great White Brotherhood his principle concern is The Great Work, or the enlightenment of others. As such, questions pertaining to future events are a nuisance to him; but he is more than happy to dispense strong trance to the aspirant, or information that will prove useful to individual magical development.
The method for contacting Tempe is simple: furnish the altar with his seal (see picture); banish the working space; and burn some incense (abramelin is apt, as is anything of a mercurial nature). Adopt a meditative posture and then invoke Tempe by inviting him to join you. (I leave the details up to your imagination.)
Close your eyes and wait for contact. This may be experienced as a direct vision of Tempe, or you may simply feel a strong trance coming on. The session will conclude naturally with the end of the vision or trance.
As the aim of this working is not specifically a vision, Tempe may be invoked before each daily meditation session as a meditative aid.