Originally horoscope referred to the astrological chart itself, but is now popularly used to refer to the description of how current planetary positions are affecting you personally, as in "your monthly horoscope."
Progressions are another way to look at the evolving positions of the planets, as compared to your natal planets, and are interpreted as follows: the interaction between the progressed and natal positions can be interpreted as strongly related to the current events in your life, both external events as well as psychological transformations you are in the midst of. The timing of progressions is slower than for transits, and is given in the first paragraph of the interpretation for the progressed aspect.
The Sabian Symbols were channeled in 1925 by Astrologer Marc Edmond Jones and psychic Elsie Wheeler in a park in San Diego. There are 360 symbols. These have subsequently been analyzed and studied extensively, see for example Dane Rudhyar's An Astrological Mandala, or Lynda Hill's The Sabian Symbols As An Oracle and have proven to be effective symbols for the particular degree of the (Western) Zodiac occupied by natal or transiting planets, such as the Sun degree of one's own chart, an indicator of character. Many use the Sun degree and the Moon degree of a chart but avoid the Rising degree as this could be one of several.
Transits are the current positions of the planets, as compared to your natal planets, and are interpreted as follows: the interaction between the current and natal positions can be interpreted as strongly related to the current events in your life, both external events as well as psychological transformations you are in the midst of. The timing of the transits (which can last weeks or months) is given in the first paragraph of the interpretation for the transiting aspect.
Indicates the Cusp of the First House. The Ascendant, or Rising Sign, is the mask shown to others, the way we present ourselves. This sign, along with the sign of the Sun and the sign of the Moon, is an important component of your personality. The sign on the Ascendant often describes one's physical appearance. The Ascendant represents your persona, or how you appear to others, how others sense you, in your true interaction with the world. In esoteric tradition, the Ascendant represents your true or soul-level personality.
Indicates the cusp of the Seventh House. The sign on the Descendant often indicates the type of marriage partner you will seek.
Midheaven or MC
The Midheaven or MC (Medium Coeli) is the point in the sky directly overhead relative to the position on Earth. In the chart, the Midheaven is represented by the vertical line at the top of the chart between the Ninth and Tenth Houses. The midheaven usually, but not always, indicates the tenth house cusp. Symbolically, the Midheaven represents your individuality, the outward expression of your energies. It can also be referred to as ego identity, and has a strong connection with public life and career, as symbolized by the tenth house. The Midheaven also represents your aspirations and ideals. Together with the ascendant, it represents personality in interaction with the world. Natal planets in conjunction with the Midheaven are considered "elevated" and are emphasized in the chart.
Nadir or IC
Indicates the cusp of the Fourth House. As the base of operations of the personality this house is quite important, because without a place to stand emotionally, the personality cannot function.
The First House symbolizes the acting self, the personality as it appears to others, and the unfolding of one's individual destiny. Its beginning point is the Rising sign/degree, one of the most significant points in the birthchart. Planets in the First House affect your personality strongly. Their characteristics are a keynote of your personality as you express yourself to others.
The Second House symbolizes what the self has to work with materially: possessions, money, and physical resources. This house also represents your desires and values. Planets in the Second House operate in the field of material needs and also indicate what you value most highly.
The Third House symbolizes thinking and communication, also traditionally brothers and sisters, writings, and short journeys. Your early environment is also represented by this house, as well as your powers of analysis and discrimination. Planets in this house indicate how you communicate and operate mentally.
Types of charts
An astrological technique in which the planets of two individuals are shown in a bi-wheel chart, one within the other. This allows the inter-aspects between the two charts to be examined.
An astrological technique in which the midpoints of two individuals' planetary positions are used to create a third chart, the composite chart, which is then interpreted as the chart of the relationship itself as an independent entity.