A twin is one of two offspring produced in the same pregnancy . Twins can either be identical ( in scientific usage , monozygotic ) meaning that they develop from one zygote that splits and forms two embryos or fraternal ( dizygotic ) because they develop from two separate eggs that are fertilized by two seperate sperms . The twin birth rate is about 35 live births per 1000 . It becomes imperative for the astrologers to fix correct position of ascendant and other cuspal positions for twins to ensure that the individual charts satisfy all conditions .
In addition we need to look for special conditions that need to be satisfied for twin charts . One born a little earlier than the other is called elder twin and the other born a little later is called the younger one . The sub sub lord of each chart should establish link with the moon star that is common for both . the sub sub lord of ascendant of both may be different to indicate two different persons . Sub sub lord of ascendant and ss arc of ascendant of each twin should indicate the sex of the individual twin .
The sub sub lord of the ascendant of the elder twin should be linked with the third cusp to promise the birth of the younger co born sub lord of 11 th cusp should be linked with ascendant to promise the birth of elder co – born . In the chart of the elder co- born the sub sub lord of the 3rd cusp should be linked with the planet that is the common moon star for the twins . Similarly the ssl of 11th cusp in the chart of the younger twin should be linked with the planet that is common moon star for both the twins .