The Rishis have taken special attention to certain Tithis and given the birth during these Tithis Dosha criteria.
These are Caturdashi of Krishna Paksha and Amaavasyaa.
A birth occurring during these two Tithis are said to suffer some flaw, independent of the other strengths in the chart. Mahaarishi Paraashara has given two separate chapters to spell out the effect as well as the remedies to be done for this.
Tithis are Jala Tatwa and the Grahas representing Jala Tatwa are Chandra and Shukra. This gives us a clue as to the area of life affected by Tithis.
Chandra is a Kaaraka for Bhakti (Devotion) and Shukra is a Kaaraka for marriage and married life. The lord of the Tithi at birth tells us a great deal about married life of the native.

RishiRahul and vivek.

We are already acquainted with Nakshatras. The Nakshatra given in a Panchaanga is the one occupied by Chandra. Great importance is attached to this.
The Nakshatra occupied by Chandra at birth is called the Janma Nakshatra (birth Nakshatra) and being Vaayu Tatwa (Air element) it has avery great importance in longevity judgement.
The Life span is counted as the number of breaths alloted to a person and as soon as it is used there is demise of the person.

The nakshatra rulers are as per the Vimshottari reckoning.
Ashwini is ruled by Ketu.
Bharani is rules by Shukra.
Krittika is ruled by Surya.
Rohini is ruled by Chandra.
Mrigashira is ruled by Mangal.
Aardra is ruled by Raahu.
Punarvasu is ruled by Guru.
Pushya is ruled by Shani.
Aashlesha is ruled by Budha.

There after again the Grahas repeat as rulers in the same order.
Magha is ruled by Ketu.
Poorva Phalguni is ruled by Shukra.
Uttar Phalguni is ruled by Surya.
Hasta is ruled by Chandra.
Chitra is ruled by Mangal.
Swaati is ruled by Raahu.
Vishaakha is ruled by Guru.
Anuraadha is ruled by Shani.
Jyestha is ruled by Budha.

Again the cycle repeats.
Moola is ruled by Ketu.
Poorva Ashaadha is ruled by Shukra.
uttara Ashaadha is ruled by Surya.
Sravana is ruled by Chandra.
Dhanista is ruled by Mangal.
Satabhisaj is ruled by Raahu.
Poorva Bhaadrapada is ruled by Guru.
Uttar Bhaadrapada is ruled by Shani.
Revati is ruled by Budha.

In the example chart given previously the child was born in Revati Nakshatra and the ruler is Budha.

RishiRahul and vivek.

Gandaanta Dosha.
Gandaanta means an evil junction.

Gandaanta is the junction of the Water (Jala Raashi) and fire (Agni Raashis).
The two Tatvas – Water and Fire are inimical to each other and hence births during this period suffer from a Tatva Dosha.
This not only applies to Chandra but also to Lagna if it so placed.

There are three such junctions.
The Junction of Karka and Simha. The last Pada of Aashlesha and first pada of Makhaa.

The junction of Vrischika and Dhanu. The last Pada of Jyestha and the first pada of Moola.

The Junction of Meena and Mesha . The Last Pada of Revati and the first Pada of Ashwini.

Birth during these padas are said to suffer from this Dosha.
Amongst these three, birth between Meena and Mesha Gandaanta is called Swa (Self) Gandaanta. This is of least intensity.
Birth during Kark and Simha Gandaanta is called Maatri (Mother) Gandaanta. This is of middling intensity.
Birth during Vrischika and Dhanu Gandaanta is called Piri (Father) Gandaanta this is of the most intensity. The reason for this is that the deities of these two Nakshatras are Indra (for Jyestha) and Nirriti (for Moola). Indra is a Deva (God) and Nirriti is a Raakshsa (Demon) and in Vedic Mythology these two are always fighting each other. This Gandaantar Dosha is discussed in great detail in the classical texts and the students are advised to read more about it.

The example chart given previously has Chandra placed in the Last Pada of Revati and hence the Horoscope suffers from Gandaantar dosha.

Eka Nakshatra Dosha.
If in a family people share the same Nakshatra then it is a Dosha.
For example two or more siblings are born in the same Nakshatra. One of the Parent and child has the same Nakshatra. The Dosha is called Eka Nakshatra Dosha.
The younger of the two suffers because of this and the suffering starts after they start living separately or independently.
The suffering is felt in money and health matters if it is the same Nakshatra but, if the Pada of the Nakshatra is also the same then it affects the health severely.
Remedies have been suggested by Maharishi Paraashar and a studious learner should be aware of it.

Yoga
Yoga means to add, join or unite.
Amongst the five limbs, Yoga is Aakaash Tatva, The space. Space is a prime requsite for any matter to exist. Infact, it binds matter toghether.
Tithi is Jala and Jala Tatwa Grahas Chandra and specifically Shukra rule Tithis. Shukra is the Raakshasha Guru.
Yoga on the other hand is Aakaasha and this Tatwa is ruled by Guru (Also called Brihaspati - the lord of expansion). Brihaspati is the Guru of Devas.    
Yoga is a benefic state that is said to exist at any instance of time. There
are 27 yogas just like the 27 Nakshatras (This gives us a clue of some strong relationship between the two).

Yoga at any instance of time is best explained by the method of calcula-
tion. Yoga is determined by the sum total of the positions of Sun and Moon.
Each yoga is represented by 13° 20' degrees (A circle of 360 degrees
divided by 27 units gives 13° 20' per unit). Therefore, the sum total of the
positions of Moon and Sun is counted in intervals 13° 20' degrees to arrive
at the Yoga. [Whenever the total exceeds 360°, 360° is subtracted from the
total for the calculation purpose. example: Sun 270° + Moon 200° = 470° -
360° = 110°
110° divided by 13°20' gives a quoteint of 8 and remainder of 3°20' which means the ninth Yoga was ruling at that time, which is Shoola.
The yogas and their Graha rulers are:

1 Vishkumbha - Shani

2 Preethi- Budha

3 Aayushman - Ketu

4 Soubhaagya - Shukra

5 Shobhana - Ravi

6 Athiganda - Chandra

7 Sukarman - Mangal

8 Dhruthi - Raahu

9 Shoola - Guru

10 Ganda - Shani

11 Vruddhi - Budha

12 Dhruva - Ketu

13 Vyaaghaatha - Shukra

14 Harshana - Ravi

15 Vajra - Chandra

16 Siddhi - Mangal

17 Vyathipaata - Raahu

18 Vareeyaan - Guru

19 Parigha - Shani

20 Shiva - Budha

21 Siddha - Ketu

22 Saadhya - Shukra

23 Shubha - Ravi

24 Shukla - Chandra

25 Brahma - Mangal

26 Aindra - Raahu

27 Vydhruthi - Guru

RishiRahul and vivek.

The ruler of the various Yogas are in the order of the vimshottari system of reckoning the Nakshatra lords. The first Yoga is ruled by Shani because the count of Yoga starts from Pushya Nakshatra.
Pushya's deity is Brihaspati another name for Guru Graha and we know that Yoga is ruled by Aakaash Tatwa represented by Guru.
The ruler of the Yoga at birth is called as 'Yogi Graha' or simply- Yogi.
This Graha plays a great role in the Horoscope to bring Yoga (Good results).
In fact there is a whole system based on the Yogi and its opposite - the Avayogi propounded by the Late Sheshadri Iyer and made very popular in the western countries by Hart deFouw ji. It is called as the Iyer's system.
Not going into this system we will learn only the Traditional approach to the Yogi.

In the Example Horoscope given, the yoga is Saadhya and its ruler is Shukra and hence Shukra becomes the Yogi for this child.

RishiRahul and vivek.